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Ophthalmology 2020 Jun 29. Epub 2020 Jun 29.

Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, TX. Electronic address:

Intraocular lens (IOL) power calculations are less accurate in eyes that have undergone corneal refractive surgery. A wide range of methods have been proposed. We reviewed the methods and outcomes of IOL power calculations in eyes with previous laser in-situ keratomileusis (LASIK), excimer laser photorefractive keratectomy (PRK), or radial keratotomy (RK). Read More

J Refract Surg 2020 Jun;36(6):358-365

Purpose: To compare clinical outcomes between topography-guided customized ablation treatment (TCAT) and wavefront-optimized (WFO) photorefractive keratectomy (PRK) in fellow eyes of myopic patients.

Methods: Forty-six eyes of 23 patients who underwent PRK were included. WFO ablation was performed in one eye (WFO group) and TCAT in the fellow eye (TCAT group). Read More

Korean J Ophthalmol 2020 Jun;34(3):210-218

Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.

Purpose: To compare the visual outcomes and corneal aberrations between wavefront-optimized (WFO) and corneal wavefront-guided (WFG) photorefractive keratectomy (PRK) in low to moderate myopia.

Methods: Twenty-seven eyes treated with WFO and 29 eyes treated with WFG PRK using a Schwind Amaris 750S Excimer laser were included after 6 months of postoperative follow-up. Uncorrected distance visual acuity, corrected distance visual acuity, refractive errors, corneal higher-order aberrations (HOA) and corneal thickness obtained using a Scheimpflug system, and central ablation depth and volume were evaluated during the preoperative period and again at the postoperative 6-month visits. Read More

Curr Opin Ophthalmol 2020 Jul;31(4):261-267

Department of Ophthalmology and Visual Sciences, W. K. Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan, USA.

Purpose Of Review: As keratoconus is a chronic disease affecting young people, vision-related quality of life is often significantly impaired in patients with this disease. However, successful management of keratoconus, including visual rehabilitation strategies, can improve quality of life in these patients. This review will describe clinical approaches that improve vision-related quality of life in patients with stable keratoconus. Read More

J Cataract Refract Surg 2020 May 28. Epub 2020 May 28.

From the Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences (R. Salouti, Kamalipour, Masihpour, Nowroozzadeh).

Purpose: To evaluate agreement of anterior segment variables between Pentacam-AXL and IOLMaster 700 before vs after photorefractive keratectomy (PRK).

Setting: Salouti Eye Clinic; Shiraz, Iran.

Design: Prospective cohort with inter-device agreement analysis. Read More

Clin Ophthalmol 2020 24;14:1091-1100. Epub 2020 Apr 24.

TLC Laser Centers, Greensboro, NC, USA.

Purpose: To identify the laser programming strategy that will achieve optimal refractive outcomes of LASIK with a topography-guided laser for eyes with a disparity between cylinder measured by manifest refraction and cylinder measured by topography.

Setting: Six surgeons at 5 clinical sites in the USA.

Design: Retrospective data review. Read More

Indian J Ophthalmol 2020 May;68(5):755-761

Department of Nutrition, University of North Carolina at Greensboro, Greensboro, North Carolina, USA.

Purpose: To compare the visual outcome, safety, safety index, efficacy, efficacy index and corneal transparency between single-step transepithelial photorefractive keratectomy (t-PRK) and conventional photorefractive keratectomy (PRK) with manual debridement of epithelium in eyes with low to high simple myopia and compound myopic astigmatism.

Methods: In this retrospective ,case control study, we analysed and compared the postoperative uncorrected visual acuity(UCVA), postoperative best corrected visual acuity (BCVA) , safety, safety index,efficacy,efficacy index and the corneal transparency between t-PRK and PRK with 6-generation Amaris excimer 500E laser (Schwind eye-tech-solutions) in 115 eyes of 59 patients.

Results: Preoperative Mean Refractive Spherical Equivalent (MRSE) was - 3. Read More

Clin Exp Ophthalmol 2020 Apr 21. Epub 2020 Apr 21.

Vision Performance Centre, Military Medicine Institute, Singapore Armed Forces, Singapore, Singapore.

Importance: This study reports outcomes of myopic photorefractive keratectomy (PRK) in a mainly ethnic Chinese population in Singapore.

Background: To assess the incidence and associations of corneal haze and endothelial cell count (ECC) loss up to 12 months after PRK.

Design: This was a retrospective case series conducted in a tertiary eye centre. Read More

Lasers Med Sci 2020 Apr 15. Epub 2020 Apr 15.

Isfahan Eye Research Center, Department of Ophthalmology, Isfahan University of Medical Sciences, Isfahan, Iran.

This study aimed to compare the visual outcomes after photorefractive keratectomy (PRK), with and without the iris registration (IR) technology. The retrospective cohort study was performed for wavefront-guided PRK using the Technolas 217z100 excimer laser system in patients with myopic astigmatism (cylinder error - 2 to - 4 diopter [D]). Eyes were divided into IR group (IRPRK) and non-IR group (non-IRPRK). Read More

Clin Ophthalmol 2020 31;14:977-984. Epub 2020 Mar 31.

Department of Ophthalmology, Faculty of Medicine, University of Alexandria, Alexandria, Egypt.

Background: The purpose of this retrospective study was to evaluate cylinder axis agreement between manifest refraction (MR), cycloplegic refraction (CR), Allegro Oculyzer ІІ and Allegro Topolyzer-Vario.

Methods: We included 82 patients (32 males and 50 females, 28.1 ± 8. Read More

J Cataract Refract Surg 2020 04;46(4):534-539

From the Department of Ophthalmology, Baylor College of Medicine, Cullen Eye Institute (Cao, Wang, Koch), Houston, Texas, USA; and Aier School of Ophthalmology, Central South University (Cao), Changsha, Hunan Province.

Purpose: To evaluate the outcome of toric intraocular lens (IOL) implantation in eyes with previous laser in situ keratomileusis/photorefractive keratectomy (LASIK/PRK).

Setting: Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.

Design: Retrospective case series. Read More

J Cataract Refract Surg 2020 04;46(4):507-516

From the Lindenhurst Eye Physicians and Surgeons PC (Nattis), Babylon, and Weill-Cornell Medicine (Rosenberg), TLC Laser Eye Centers (Nattis and Donnenfeld), and Garden City Ophthalmic Consultants of Long Island (Donnenfeld), Garden City, New York, USA.

Purpose: To evaluate long-term visual and astigmatic outcomes of sequential corneal crosslinking (CXL) followed by topography-guided photorefractive keratectomy (PRK).

Setting: Single-practice outpatient setting.

Design: Retrospective case review. Read More

Acta Inform Med 2020 Mar;28(1):24-28

NHS National Services Scotland, Edinburgh, United Kingdom.

Introduction: Refractive surgery procedures, transepithelial photorefractive keratectomy (T-PRK) and femtosecond laser in situ keratomileusis (Fs-LASIK) are regarded as safe and efficacious methods for correcting myopia and myopic astigmatism. These two methods do not have much differences in results when treating spherical myopia, while some differences does exist in treatment of myopic astigmatism. Vector analysis presents powerful tool to show the real differences between these two methods regarding higher order ocular aberrations and central corneal thickness of treated eyes. Read More

J Cataract Refract Surg 2020 02;46(2):276-286

From the Kensington Eye Institute (Singal, Ong Tone, Stein, Bujak, Chan, Chew, El-Defrawy, Jin, Kranemann, Rabinovitch, Rootman, Slomovic, Hatch), Department of Ophthalmology and Vision Sciences, University of Toronto (Singal, Ong Tone, Stein, Bujak, Chan, Chew, El-Defrawy, Jin, Kranemann, Rabinovitch, Rootman, Slomovic, Hatch), Kensington Crosslinking Working Group (Singal, Ong Tone, Stein, Bujak, Chan, Chew, El-Defrawy, Jin, Kranemann, Rabinovitch, Rootman, Slomovic, Hatch), and St. Michael's Hospital (Cohen, Dai), Toronto, Ontario, Canada.

Purpose: To compare accelerated corneal crosslinking (CXL) alone, CXL with simultaneous intrastromal corneal ring segments (CXL-ICRS), and CXL with simultaneous topography-guided photorefractive keratectomy (CXL-TG-PRK) in progressive keratoconus, pellucid marginal degeneration (PMD), or laser in situ keratomileusis (LASIK)-induced ectasia.

Setting: The Kensington Eye Institute and Bochner Eye Institute, Toronto, Canada.

Design: Prospective nonrandomized interventional study. Read More

J Cataract Refract Surg 2020 02;46(2):267-275

From the Labbafinejad Medical Center, Department of Ophthalmology, Shahid Beheshti University of Medical Sciences (Faramarzi, Hassanpour, Yazdani), Tehran, Iran; and John A Moran Eye Center, Department of Ophthalmology and Visual Sciences, University of Utah (Moshirfar), Salt Lake City, USA.

Purpose: To study the effect of pupil centroid shift (PCS) compensation on lower- and higher-order aberrations (HOAs) after photorefractive keratectomy (PRK).

Setting: Labbafinejad Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Design: Prospective intrasubject fellow eye study. Read More

Int Ophthalmol 2020 May 25;40(5):1291-1298. Epub 2020 Jan 25.

Ophthalmology Department, Oftalmocentro, Av. Nilo Peçanha, 724/401, Porto Alegre, RS, Brazil.

Purpose: The aim of this study is to report our results of toric intraocular lens (IOL) implantation in patients with asymmetric astigmatism, its efficacy and safety in reducing the refractive cylinder.

Methods: This is a retrospective cohort study. Patients with asymmetric astigmatism and non-progressive corneal ectasia, unable to fit hard contact lenses, with poor-corrected visual acuity or unsatisfactory spectacles-corrected visual acuity, underwent cataract surgery with toric IOL implantation. Read More

Lasers Med Sci 2020 Jan 10. Epub 2020 Jan 10.

Ankara Onkoloji Research and Training Hospital, Ankara, Turkey.

To evaluate the postoperative higher-order aberration (HOA) differences and visual quality outcomes of wavefront-optimised photorefractive keratectomy (PRK) surgery in 6.5-mm and 7.0-mm optic zones. Read More

Int J Ophthalmol 2019 18;12(12):1929-1938. Epub 2019 Dec 18.

Department of Ophthalmology, College of Medicine, Qassim University, Qassim, Buraidah 51452, Kingdom of Saudi Arabia.

Keratoconus and iatrogenic keratectasia are the corneal ectatic disorders occurring due to biomechanical weakening of the cornea resulting in distorted images, myopia, and irregular astigmatism. Corneal collagen cross-linking (CXL) is performed to arrest keratoconus successfully. The main aim of this review is to discuss the safety and efficacy of the adjuvant therapies, such as the combination of CXL and photorefractive keratectomy (PRK) for the treatment of corneal ectatic disorders. Read More

Saudi J Ophthalmol 2019 Jul-Sep;33(3):203-208. Epub 2019 Feb 13.

Specialized Experts Center, Riyadh, Saudi Arabia.

Purpose: To study clinical and histopathological findings of corneal opacification caused by thickened epithelium leading to reduced vision and topographical changes and to evaluate the outcome of its removal.

Methods: Twelve patients (17 eyes) with central, paracentral or peripheral corneal opacification were reviewed to obtain their visual acuity, describe their slit lamp (SL) appearance (depth, extent and density) and document their topographic changes before and after peeling of the epithelium under SL or surgical removal under the microscope. Specimens of six cases were available for histopathological examination and immunohistochemical staining. Read More

Korean J Ophthalmol 2019 Oct;33(5):458-466

Department of Ophthalmology, Hatay State Hospital, Hatay, Turkey.

Purpose: To investigate the clinical effects of different orientation and magnitude of cyclotorsion on the compensation capacity of the WaveLight EX500 photorefractive keratectomy (PRK) platform.

Methods: This retrospective study comprised 400 eyes of 200 patients who underwent bilateral simultaneous PRK due to compound myopic astigmatism. The subjects were separated according to the orientation of cyclotorsion into incyclotorsion and excyclotorsion groups, and by the magnitude of cyclotorsion into group 1 (0. Read More

Am J Ophthalmol 2020 01 14;209:45-54. Epub 2019 Sep 14.

Care-Vision Laser Centers, Tel-Aviv, Israel; Department of Ophthalmology, Barzilai Medical Center, Ashkelon, and the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheba, Israel.

Purpose: To characterize age- and sex-related changes in corneal refractive parameters in myopic and hyperopic patients undergoing refractive surgery.

Design: A retrospective cross-sectional study.

Methods: Analysis of demographic and refractive parameters of myopic and hyperopic patients who underwent laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK) between January 2000 and December 2014 at the Care-Vision Laser Centers, Tel-Aviv, Israel. Read More

J Optom 2019 Oct - Dec;12(4):240-247. Epub 2019 Aug 28.

Research and Development, SCHWIND Eye-Tech-Solutions, Kleinostheim, Germany.

Purpose: To investigate immediate and short-term visual recovery in a large cohort of 2093 myopic eyes (with or without astigmatism) treated with SmartSurf procedure, a combination of Transepithelial Photo Refractive Keratectomy (PRK) and Smart Pulse Technology (SPT, SCHWIND eye-tech-solutions GmbH, Kleinostheim, Germany).

Methods: In this retrospective case series, post-operative outcomes were evaluated immediately after the surgery (Day 0), at day 1 and 3 months postoperatively, after myopic SmartSurf treatment with mean pre-operative spherical equivalent -4.65±2. Read More

Can J Ophthalmol 2019 06 28;54(3):374-381. Epub 2018 Nov 28.

Bochner Eye Institute, Toronto, Ont.

Objective: To determine the misdiagnosis of ectasia in patients referred for corneal crosslinking and possible topography-guided photorefractive keratectomy (PRK) or intrastromal corneal rings.

Setting: Bochner Eye Institute, Toronto, Ontario, Canada.

Design: Retrospective data review. Read More

Int Ophthalmol 2019 Nov 7;39(11):2569-2574. Epub 2019 May 7.

Ophthalmology Department, World Eye Hospital, Ankara, Turkey.

Purpose: To compare the efficacy of Samfilcon A and Lotrafilcon B bandage contact lenses after photorefractive keratectomy (PRK).

Methods: In this study, patients with bilateral PRK were assigned for the fitting of Lotrafilcon B lens and Samfilcon A lens. The patients were examined on the day of surgery and on postoperative days 1, 2 and 3. Read More

J Curr Ophthalmol 2019 Mar 6;31(1):36-42. Epub 2018 Nov 6.

Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.

Purpose: To evaluate static and dynamic cyclotorsions during photorefractive keratotomy (PRK) surgery in refractive surgery candidates and their correlations with preoperative factors.

Methods: This cross-sectional case series was performed in 138 eyes of 77 patients who underwent PRK surgery by Technolas 217z100. Iris registration was used to evaluate the degree of static and dynamic cyclotorsion. Read More

Clin Ophthalmol 2019 7;13:115-121. Epub 2019 Jan 7.

Byers Eye Institute, Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, CA, USA,

Purpose: The aim of this study was to report the 1-week and 6-month refractive outcomes of eyes treated with a novel silicone corneal shield designed to improve visual recovery after photorefractive keratectomy (PRK).

Patients And Methods: This prospective, observational clinical trial recruited 45 myopic eyes with or without astigmatism at a university eye clinic to undergo wavefront-guided PRK followed by application of an investigational silicone corneal shield that was removed on postoperative day 4. The primary outcome measures were efficacy, predictability, and safety at the 6-month visit. Read More

Cornea 2019 May;38(5):612-616

LaserVision Clinical and Research Eye Institute, Athens, Greece.

Purpose: To compare the outcomes and complications of Epi-Bowman blunt keratectomy (EBK) using a blunt epikeratome (Epi-Clear, Orca Surgical, Israel), with alcohol delamination of the corneal epithelium during photorefractive keratectomy (PRK) in contralateral eyes.

Methods: This prospective, randomized contralateral eye study included 44 eyes of 22 patients undergoing PRK for bilateral myopia or myopic astigmatism. In each patient, epithelial delimitation was performed using an Epi-Clear epikeratome EBK (EBK group) on 1 eye and diluted ethanol (EtOH) on the fellow eye (EtOH group). Read More

Cornea 2019 Mar;38(3):285-289

Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, ON, Canada.

Purpose: To report the outcome of wavefront-guided photorefractive keratectomy (WG-PRK) in the treatment of high astigmatism following keratoplasty.

Methods: A retrospective, interventional analysis including patients with high astigmatism following either penetrating keratoplasty or deep anterior lamellar keratoplasty, who underwent WG-PRK.

Results: Thirteen eyes (7 right eyes) of 12 patients (10 male) aged 35. Read More

Taiwan J Ophthalmol 2018 Jul-Sep;8(3):149-158

Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou, Taiwan.

Purpose: The aim of this study is to evaluate the effectiveness and predictability of photorefractive keratectomy (PRK) for correcting residual refractive error following cataract surgery with premium intraocular lens (IOL) implantation.

Methods: We conducted a retrospective review of the medical records of patients who received PRK for correcting residual hyperopia, myopia, and/or astigmatism due to unsatisfied uncorrected distance visual acuity (UDVA) after cataract extraction with implantation of aspheric, diffractive multifocal, or toric IOL from September 2011 to December 2017. Pre-cataract surgery, pre- and post-PRK data including UDVA, best-corrected distance visual acuity, and refractive status were analyzed. Read More

Open Ophthalmol J 2018 26;12:256-263. Epub 2018 Sep 26.

Faculty of Medicine and Health Sciences, An-Najah National University Hospital, An-Najah National University, Nablus, Palestine.

Background: Laser corneal refractive surgery suits, technology and nomograms are improving with time. This may improve the refractive and visual outcomes of the patients.

Objectives: To evaluate the safety, efficacy, stability, and predictability of wavefront-optimized photorefractive keratectomy and Laser-assisted keratomileusis in patients with myopia and myopic astigmatism over 1-year using WaveLight EX500 Excimer Laser machine. Read More

J Cataract Refract Surg 2018 Nov 7;44(11):1350-1354. Epub 2018 Sep 7.

From the Byers Eye Institute (Lee, Toy, Manche), Stanford University School of Medicine, Palo Alto, and the USC Roski Eye Institute (Toy), University of Southern California, Los Angeles, California, USA. Electronic address:

Purpose: To compare astigmatic outcomes between eyes having wavefront-guided laser in situ keratomileusis (LASIK) and eyes having wavefront-guided photorefractive keratectomy (PRK).

Setting: Byers Eye Institute, Stanford University School of Medicine, Palo Alto, California, USA.

Design: Prospective randomized case series. Read More

J Refract Surg 2018 Sep;34(9):590-596

Purpose: To compare contrast sensitivity among participants undergoing wavefront-guided or wavefront-optimized photorefractive keratectomy (PRK) or LASIK for the treatment of myopia or myopic astigmatism 12 months after surgery.

Methods: In a prospective, randomized clinical trial, 215 participants with myopia ranging from -0.50 to -7. Read More

Graefes Arch Clin Exp Ophthalmol 2019 Jan 18;257(1):225-232. Epub 2018 Aug 18.

Care-Vision Laser Centers, Tel-Aviv, Israel.

Purpose: To evaluate a multiple regression-derived nomogram for myopia and myopic astigmatism photorefractive keratectomy (PRK).

Methods: Regression modeling derived a formula for spherocylindrical correction in wavefront-optimized PRK (nomogram II). Treatment outcomes between eyes with myopia and myopic astigmatism using the manufacturer's nomogram (nomogram I) in the years 2010-2013 were retrospectively compared with eyes treated using nomogram II in the years 2014-2015. Read More

BMC Ophthalmol 2018 Aug 14;18(1):198. Epub 2018 Aug 14.

Department of Ophthalmology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran.

Backgtound: Photorefractive keratectomy (PRK) is used for a wide range of refractive errors such as low to moderate myopia, hyperopia and astigmatism. While many improvements have been made in laser application and accuracy as well as the modes of corneal flap removal, and although the results are somewhat predictable, regression of refractive errors is still a common complaint among the patients undergoing refractive surgery with Excimer Laser. We aimed to determine related factors of regression following photorefractive keratectomy (PRK) in different types of refractive errors. Read More

J Refract Surg 2018 Aug;34(8):541-546

Purpose: To evaluate the outcomes after topography-guided ablation treatment (T-CAT) for the correction of myopia and myopic astigmatism with photorefractive keratectomy (PRK).

Methods: This was a retrospective, non-comparative case series study of 25 patients (40 eyes) with low to moderate myopia with or without astigmatism who underwent topography-guided custom PRK with the Wave-Light EX500 excimer laser platform (Alcon Laboratories, Inc., Fort Worth, TX). Read More

J Refract Surg 2018 Aug;34(8):533-540

Purpose: To investigate the clinical outcomes, vector parameters, and corneal aberrations of corneal wavefront-guided (CWFG) transepithelial photorefractive keratectomy (PRK), according to epithelial thickness.

Methods: This retrospective, comparative case series study included 91 eyes (91 patients) that underwent CWFG transepithelial PRK for myopic astigmatism. Epithelial thickness was less than 50 μm in 48 patients and 60 μm or greater in 43 patients. Read More

Eye Contact Lens 2019 Mar;45(2):132-136

Joint Shantou International Eye Center (R.Z., L.S., J.L., V.J., M.Z.), Shantou, People's Republic of China; Department of Ophthalmology and Visual Sciences (R.Z., L.S., J.L., A.L., V.J., M.Z.), The Chinese University of Hong Kong, Hong Kong, People's Republic of China; and UPMC Eye Center (V.J.), University of Pittsburgh School of Medicine, Pittsburgh, PA.

Purpose: To compare the visual and refractive outcomes of transepithelial photorefractive keratectomy (Trans-PRK) and sub-Bowman femtosecond-assisted laser in situ keratomileusis (SBK).

Setting: University hospital.

Design: Retrospective, comparative study. Read More

J Cataract Refract Surg 2018 Aug 20;44(8):1003-1011. Epub 2018 Jul 20.

From Lindenhurst Eye Physicians and Surgeons (Nattis), Babylon, Ophthalmic Consultants of Long Island (Donnenfeld), Garden City, the Department of Ophthalmology (Rosenberg), New York Medical College, Valhalla, Nassau University Medical Center (Perry), and Ophthalmic Consultants of Long Island (Perry), Rockville Centre, New York, USA.

Purpose: To evaluate a sequential treatment algorithm for visual and keratometric improvement in keratoconus patients after corneal crosslinking (CXL) followed by topography-guided photorefractive keratectomy (PRK).

Setting: Ophthalmic Consultants of Long Island, Garden City, New York, USA.

Design: Retrospective case series. Read More

J Refract Surg 2018 Jul;34(7):466-474

Purpose: To evaluate the outcomes of transepithelial photorefractive keratectomy (PRK) in moderate to high astigmatism with a non-wavefront-guided aberration-neutral ablation profile using SmartPulse allocation.

Methods: In this retrospective study, myopic patients with a preoperative cylinder of 2.00 diopters (D) or greater were analyzed at 3 months of follow-up. Read More

BMC Ophthalmol 2018 Jun 26;18(1):154. Epub 2018 Jun 26.

The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemungu, Seoul, 03722, South Korea.

Background: To compare the clinical outcomes of wavefront-optimized (WFO) transepithelial photorefractive keratectomy (trans-PRK) and corneal wavefront-guided (CWFG) trans-PRK for myopic eyes with moderate to high astigmatism.

Methods: One hundred ninety-six eyes (196 patients) with moderate to high astigmatism (≥ 1.75 D) treated with WFO or CWFG trans-PRK (101 and 95 eyes, respectively) were retrospectively registered. Read More

Am J Ophthalmol 2018 08 1;192:98-103. Epub 2018 Jun 1.

Department of Research and Development, Clínica Baviera, Valencia, Spain.

Purpose: To determine the functional outcomes of laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) in patients taking isotretinoin, which is contraindicated for these procedures.

Design: Multicenter, retrospective, interventional case series.

Methods: All patients taking isotretinoin who underwent LASIK or PRK from January 2003 to September 2017 were included (Group 1). Read More

Clin Ophthalmol 2018 30;12:783-790. Epub 2018 Apr 30.

Refractive Services, The Eye Foundation, Coimbatore, India.

Purpose: To assess the safety, efficacy, and refractive predictability of half-fluence accelerated corneal collagen crosslinking (CXL) applied concurrently with photorefractive keratectomy (PRK), and compare the results to standard PRK.

Setting: Refractive Services, The Eye Foundation, Coimbatore, India.

Design: Interventional comparative case series. Read More

Int J Ophthalmol 2018 18;11(4):612-615. Epub 2018 Apr 18.

Department of Surgery, Ophthalmology Clinic, University Hospital of Messina, Messina 98124, Italy.

Aim: To evaluate the efficacy and safety of the excimer laser correction of the residual refractive errors after cataract extraction with intraocular lens (IOL) implantation in uncommon cases.

Methods: Totally 24 patients with high residual refractive error after cataract surgery with IOL implantation were examined. Twenty-two patients had a history of phacoemulsification and IOL implantation, and two had extra-capsular cataract extraction with IOL implantation. Read More

Med Hypothesis Discov Innov Ophthalmol 2018 ;7(1):1-9

HDR Research Center, Hoopes Vision, 11820 S. State Street Suite #200, Draper, UT 84020, United States.

Laser vision correction is a safe and effective method of reducing spectacle dependence. Photorefractive Keratectomy (PRK), Laser In Situ Keratomileusis (LASIK), and Small-Incision Lenticule Extraction (SMILE) can accurately correct myopia, hyperopia, and astigmatism. Although these procedures are nearing optimization in terms of their ability to produce a desired refractive target, the long term cellular responses of the cornea to these procedures can cause patients to regress from the their ideal postoperative refraction. Read More

J Cataract Refract Surg 2018 Mar 30;44(3):274-279. Epub 2018 Mar 30.

From the Department of Ophthalmology (Ghoreishi, Peyman, Koosha, Golabchi, Pourazizi), Isfahan University of Medical Sciences and the Department of Research and Development (Ghoreishi), Parsian Clinic of Ophthalmology, Isfahan, Iran.

Purpose: To evaluate the efficacy and safety of topography-guided transepithelial photorefractive keratectomy (PRK) in a group of patients with post-radial keratotomy (RK) showing irregular corneas.

Setting: Feiz University Hospital, Isfahan, Iran.

Design: Prospective case series. Read More

J Ophthalmol 2018 11;2018:3120941. Epub 2018 Feb 11.

Department of Ophthalmology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

Purpose: To determine the unknown preoperative K readings (Kpre) to be used in history-based methods, for intraocular lens (IOL) power calculation in patients who have undergone myopic photorefractive keratectomy (PRK).

Methods: A regression formula generated from the left eyes of 174 patients who had undergone PRK for myopia or for myopic astigmatism was compared with other methods in 168 right eyes. The Pearson index and paired -test were utilized for statistical analysis. Read More

J Curr Ophthalmol 2018 Mar 9;30(1):48-53. Epub 2017 Oct 9.

Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

Purpose: To compare two-year results of femtosecond laser assisted LASIK (femto-LASIK) and photorefractive keratectomy (PRK) in terms of astigmatism correction in patients with less than 2.0 diopters (D) of spherical error and more than 2.0 D of cylinder error. Read More

Medicine (Baltimore) 2018 Mar;97(12):e0094

Rationale: Recently, some ophthalmologists performed PRK or LASEK surgeries in FFKC suspicious patients, which is supposed to prevent FFKC evolvement via fibrotic scar formation. Our report indicates that keratectasia can occur after LASEK in FFKC suspicious patients, highlighting the importance of stricter regulation of patient recruitment before the procedure and postoperative follow-up.

Patient Concerns: This is a report of a 25-year-old man with poor corrected distance visual acuity (CDVA) 6 years after LASEK. Read More