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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

Indian J Ophthalmol 2020 Jun;68(6):1186-1188

Consultant Ophthalmic Surgeon, Anterior Segment Specialist, Athens Refractive Laser Center, Athens, Greece.

We report a rare case of very late-onset haze triggered by viral conjunctivitis, > 20 years after treatment of moderate myopia with photorefractive keratectomy (PRK), and its successful management. 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

J Refract Surg 2020 May;36(5):293-299

Purpose: To assess whether densitometry analysis appropriately monitors the development of haze in myopic patients after photorefractive keratectomy (PRK) when compared to subjective slit-lamp haze grade examinations, and whether sutureless cryo-preserved amniotic membrane reduced postoperative haze development when compared to the standard bandage contact lens.

Methods: In this retrospective cohort at the Center for Refractive Surgery, Walter Reed National Military Medical Center, a secondary analysis of prospectively collected data was performed. In the prospective study, participants underwent PRK for myopia. Read More

Pharmaceuticals (Basel) 2020 Apr 15;13(4). Epub 2020 Apr 15.

Biomedical, Dental and Morphological and Functional Images Sciences, Department, University of Messina, 98122 Messina, Italy.

We aimed at evaluating the long-term effects of l-cysteine oral supplementation to basic fibroblast growth factor (bFGF) eye-drops on corneal re-epithelization and transparency in myopic patients subjected to photorefractive keratectomy (PRK). Forty patients subjected to bilateral PRK for myopia were enrolled and randomly divided into two groups receiving an additional therapy together with the standard postoperative treatment consisting in local tobramycin 0.3%, dexamethasone 0. 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

J Cataract Refract Surg 2020 04;46(4):622-632

From the Noor Ophthalmology Research Center, Noor Eye Hospital (Pakbin), and Translational Ophthalmology Research Center, Tehran University of Medical Sciences (Pakbin), and Department of Psychiatric Nursing and Management, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences (Khabazkhoob), and Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences (Pakravan), and Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences (Fotouhi), and Department of Optometry, School of Rehabilitation Science, Iran University of Medical Sciences (Jafarzadehpour), and Translational Ophthalmology Research Center, Tehran University of Medical Sciences (Aghamirsalim), and Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital (Seyedian), and Translational Ophthalmology Research Center, Tehran University of Medical Sciences (Hashemi), and Noor Ophthalmology Research Center, Noor Eye Hospital (Hashemi), Tehran, Iran.

Contradictory results of postoperative steroid application in photorefractive keratectomy (PRK) led to a meta-analysis of the existing data to achieve a definite conclusion on the optimum dosage and duration of corticosteroid therapy after PRK. The overall pooled unstandardized mean difference (PUMD) of the corneal haze score was -0.20 (95% CI, -0. Read More

J Cataract Refract Surg 2020 Apr 3. Epub 2020 Apr 3.

Warfighter Refractive Eye Surgery Program and Research Center at Fort Belvoir, Fort Belvoir, VA, USA.

Purpose: To assess the visual outcomes of small-incision lenticule extraction (SMILE) after the first year of treatments at a military refractive surgery center and compare with photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) outcomes during the same period.

Setting: Warfighter Refractive Eye Surgery Program and Research Center, Fort Belvoir, Virginia, USA.

Design: Retrospective study. 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 Refract Surg 2020 Mar;36(3):160-168

Purpose: To compare wavefront-guided (WFG) and wavefront-optimized (WFO) photorefractive keratectomy (PRK) in patients with myopia using objective and self-reported quality of vision outcomes.

Methods: A total of 40 eyes from 20 participants were prospectively randomized to receive WFG or WFO PRK with the WaveLight Allegretto Eye-Q 400-Hz excimer laser (Alcon Laboratories, Inc., Fort Worth, TX). 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 J Ophthalmol 2020 18;13(1):129-134. Epub 2020 Jan 18.

Egyptian Police Hospitals, Cairo 11765, Egypt.

Aim: To evaluate the safety and efficacy of transepithelial photorefractive keratectomy (t-PRK) with adjuvant mitomycin C (MMC) versus femtosecond laser assisted keratomileusis (Femto-LASIK) in correction of high myopia.

Methods: Prospective randomized comparative study including 156 eyes of 156 patients with high myopia and a spherical equivalent refraction (SER) <-6.00 D. 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 Environ Res Public Health 2019 12 31;17(1). Epub 2019 Dec 31.

Department of Biomedical Engineering, Cleveland Clinic, Cole Eye Institute, Cleveland, OH 44195, USA.

The use of computational mechanics for assessing the structural and optical consequences of corneal refractive procedures is increasing. In practice, surgeons who elect to perform PRK rather than LASIK must often reduce the programmed refractive treatment magnitude to avoid overcorrection of myopia. Building on a recent clinical validation study of finite element analysis (FEA)-based predictions of LASIK outcomes, this study compares predicted responses in the validated LASIK cases to theoretical PRK treatments for the same refractive error. Read More

J Cataract Refract Surg 2019 12;45(12):1782-1788

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

Purpose: To compare uncorrected distance visual acuity (UDVA) and patient-reported outcomes with a new silicone corneal shield and a conventional bandage contact lens (BCL) after photorefractive keratectomy (PRK).

Setting: Stanford Eye Laser Center (Palo Alto, California) and Slade & Baker Vision (Houston, Texas).

Design: Prospective randomized cohort study. 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

Vestn Oftalmol 2019 ;135(5):99-106

Research Institute of Eye Diseases, 11A Rossolimo St., Moscow, Russian Federation, 119021.

Small incision lenticule extraction (SMILE) keratorefractive surgery technique is a laser surgery alternative to common methods that doesn't require laser ablation of the cornea. Despite its novelty, SMILE technique has already demonstrated positive clinical results comparable to Photorefractive Keratectomy (PRK) and Laser-Assisted in Situ Keratomileusis (LASIK), which led to its widespread application in clinical practice. Compared with other keratorefractive techniques, SMILE has a number of distinct advantage including high biomechanical stability of the cornea, low risk of dry eye syndrome, absence of a corneal flap and associated complications, preservation of corneal epithelium. Read More

Am J Ophthalmol 2020 02 18;210:97-106. Epub 2019 Oct 18.

Optical Express, Glasgow, United Kingdom.

Purpose: To evaluate the incidence of adverse events (AE) following laser vision correction.

Design: Retrospective case series.

Methods: Optical Express, UK. 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

J Refract Surg 2019 Oct;35(10):632-641

Purpose: To evaluate the longitudinal changes in epithelial thickness after photorefractive keratectomy (PRK) and correlate these with refractive changes.

Methods: This prospective study included 52 eyes of 52 candidates for myopic PRK. Along with standard ophthalmic examinations, corneal epithelial thickness mapping by anterior segment optical coherence tomography was performed. 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 Refract Surg 2019 Sep;35(9):600-605

Purpose: To assess the repeatability of epithelial, stromal, and total corneal thickness measurements with spectral-domain optical coherence tomography (SD-OCT; RTVue-XR; Optovue, Inc., Fremont, CA) in patients with myopia, keratoconus, and corneas after transepithelial photorefractive keratectomy (PRK), small incision lenticule extraction (SMILE), and femtosecond laser-assisted in situ keratomileusis (FS-LASIK).

Methods: A total of 352 eyes of 352 patients (75 myopic, 68 post-transepithelial PRK, 61 post-SMILE, 75 post-FS-LASIK, 20 mild keratoconus, and 53 advanced keratoconus eyes) were included. 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

Curr Eye Res 2019 11 23;44(11):1171-1180. Epub 2019 Aug 23.

Department of Corneal and External Eye Disease, Singapore National Eye Centre, Singapore.

: Laser in-situ keratomileusis (LASIK), photorefractive keratectomy (PRK) and small-incision lenticule extraction (SMILE) are safe and effective refractive surgical procedures. However, complications include regression of treatment and iatrogenic keratectasia which can be severe and sight-threatening. In order to reduce these complications, simultaneous corneal cross-linking (CXL) is currently being added to these refractive procedures. Read More

J Refract Surg 2019 Aug;35(8):501-505

Purpose: To investigate the biomechanical properties of the ex vivo human paired corneas after completion of photorefractive keratectomy (PRK) versus small incision lenticule extraction (SMILE) in the same donor.

Methods: In this experimental study, 13 pairs of human corneas unsuitable for transplantation were equally divided into two groups. Corneal thickness was measured in each eye directly before laser refractive surgery. Read More

Vestn Oftalmol 2019 ;135(3):67-77

Ophthalmology Clinic 'Sphere', 10 Starokachalovskaya St., Moscow, Russian Federation, 117628.

Introduction: The problems of controlling inflammatory and proliferative response of the retina and correcting tear production in the post-operative period after photorefractive keratectomy (PRK) have not been fully solved yet. Patients intolerable to local steroids require an alternative. One drug that covers those needs is Cyclosporine 0. Read More

BMC Ophthalmol 2019 Aug 1;19(1):167. Epub 2019 Aug 1.

Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada.

Background: The aim of this study was to compare the postoperative corneal biomechanical properties between small incision lenticule extraction (SMILE) and other corneal refractive surgeries.

Methods: A systematic review and meta-analysis were conducted. Articles from January 2005, to April 2019, were identified searching PubMed, EMBASE, Web of Science, and International Clinical Trials Registry Platform. Read More

Klin Monbl Augenheilkd 2019 Jul 2. Epub 2019 Jul 2.

Ophthalmology, St. Petka Eye Clinic, Varna, Bulgaria.

Background: A large number of myopic patients were treated by radial keratotomy (RK) in recent years. Despite being effective in many cases, the refractive results of this surgical intervention proved to be of limited predictability, and it frequently resulted in over- or under-correction in the long term. In this study, we discuss the intermediate and long-term results of a topography-guided photorefractive keratotomy (PRK) in a consecutive series of patients who were previously treated for myopia by radial keratotomy. Read More

Graefes Arch Clin Exp Ophthalmol 2019 Sep 19;257(9):2057-2063. Epub 2019 Jun 19.

Department of Ophthalmology, Barzilai Medical Center, Ashkelon, Israel.

Purpose: Most refractive surgeries are performed in the young-adult age group, and less is known about the clinical outcomes of patients in late adulthood and of adolescents. The purpose of this study was to describe the outcomes of refractive surgery in patients over the age of 60 years and under the age of 18 years compared with a control group of patients aged 20-40 years.

Methods: This retrospective cohort analysis consisted of 64,970 consecutive cases of 32,074 patients who underwent laser-assisted in situ keratomileusis and photorefractive keratectomy during a 10-year period in a single center. Read More

Eye Contact Lens 2019 Nov;45(6):360-364

Department of Ophthalmology (K.B., N.Y., A.B.T., and G.G.), Gazi University Hospital, Ankara, Turkey; Department of Ophthalmology (N.Y.), Yildirim Beyazit University, Ataturk Training and Research Hospital, Ankara, Turkey; Department of Ophthalmology (Y.A. and M.F.K.), Ufuk University Hospital, Ankara, Turkey; Department of Ophthalmology (H.B.O.), Ulucanlar Training and Research Hospital, Ankara, Turkey; and Department of Ophthalmology (S.O.), Ankara Oncology Training and Research Hospital, Ankara, Turkey.

Purpose: To evaluate long-term corneal morphological changes after photorefractive keratectomy (PRK) using in vivo confocal microscopy (IVCM) and specular microscopy.

Methods: This comparative case-control study included 16 eyes of 8 patients who underwent PRK for mild to moderate myopia 20 years ago and 30 eyes of 15 sex- and age-matched healthy controls. Corneal epithelial cells, sub-basal nerves, keratocytes (anterior, midstromal, and posterior), and endothelial cells were evaluated in both groups 10 and 20 years after surgery. Read More

Mil Med 2019 12;184(11-12):e808-e812

Navy Refractive Surgery Center San Diego, 2051 Cushing Road, San Diego, CA 92106.

Introduction: To evaluate the long-term refractive results of laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) performed by the military in a veteran population.

Materials And Methods: Three Department of Veterans Affairs (VA) hospital sites (Puget Sound, Buffalo, and Washington D.C. 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 Cataract Refract Surg 2019 07 24;45(7):977-984. Epub 2019 Apr 24.

The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea; Corneal Dystrophy Research Institute, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. Electronic address:

Purpose: To evaluate the clinical outcomes, vector parameters, and aberrations between mechanical photorefractive keratectomy (PRK) and transepithelial PRK in eyes with low myopia.

Setting: Yonsei University College of Medicine and Eyereum Eye Clinic, Seoul, Korea.

Design: Retrospective, comparative case series. Read More

J Refract Surg 2019 Mar;35(3):161-168

Purpose: To evaluate factors associated with the change in dry eye symptoms following laser vision correction.

Methods: This was a retrospective case series of 13,319 patients who underwent laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK) between January 2013 and February 2016 and completed a preoperative and 3-month postoperative patient-reported outcome questionnaire.

Results: In a multivariate linear regression model, women and contact lens wearers were associated with worse preoperative dry eye symptoms. Read More

J Ophthalmol 2019 28;2019:6513143. Epub 2019 Jan 28.

Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.

Objective: To analyze the safety and efficacy of high-myopic PRK as an alternative to LASIK surgery in patients with a high preoperative percentage tissue altered (PTA).

Design: Retrospective interventional case series.

Participants: Charts of 256 consecutive eyes that underwent PRK with application of mitomycin-C 0. Read More

J Cataract Refract Surg 2019 04 4;45(4):427-436. Epub 2019 Feb 4.

Department of Ophthalmology, Purpan Hospital, Toulouse, France; EA 4555, Paul Sabatier University, Toulouse, France.

Purpose: To compare the outcomes of transepithelial photorefractive intrastromal corneal crosslinking (CXL) and photorefractive keratectomy (PRK) in eyes with low myopia.

Setting: Purpan Hospital, Toulouse, France.

Design: Prospective case series. 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

PLoS One 2018 14;13(12):e0208608. Epub 2018 Dec 14.

Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.

Purpose: To evaluate the predictive factors for safety and efficacy in laser refractive surgery for myopia.

Setting: A singular refractive surgery center, at a University-affiliated tertiary medical center.

Design: Retrospective cohort study. Read More

J Refract Surg 2018 Nov;34(11):726-735

Purpose: To systematically compare the efficacy, predictability, safety, postoperative haze, pain scores, and epithelial healing time of four corneal surface ablation procedures.

Methods: PubMed, Embase, Cochrane Library, and the U.S. Read More

J Cell Physiol 2019 05 11;234(5):7459-7466. Epub 2018 Nov 11.

Department of Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania.

The corneal sub-basal nerve (SBN) plexus is destroyed during photorefractive keratectomy (PRK) and its recovery is still a matter of debate. In vivo confocal microscopy (IVCM) was used to evaluate SBN plexus in 23 patients at a distance of 10-25 years (mean 15.6 years) from myopic PRK. Read More

Invest Ophthalmol Vis Sci 2018 11;59(13):5320-5328

Imaging, Biomechanics and Mathematical Modeling Solutions Lab, Narayana Nethralaya Foundation, Bangalore, India.

Purpose: To simulate deformation amplitude after laser-assisted in situ keratomileusis (LASIK), small incision lenticule extraction (SMILE), and photorefractive keratectomy (PRK) with finite element models.

Methods: Finite element simulations of air-puff applanation on LASIK, SMILE, and PRK models were performed on a cohort of normal eyes, which had undergone refractive treatments. Short- and long-term wound healing responses were considered for SMILE and LASIK models based on evidence of microdistortions in Bowman's layer and crimping of collagen fibers. Read More

Zhonghua Yan Ke Za Zhi 2018 Oct;54(10):737-743

Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.

To explore nerve fiber regeneration and subjective visual quality of patients undergoing small incision lenticule extraction (SMILE) surgery, femtosecond laser-assisted in-situ keratomileusis (FS-LASIK) and transepithelial photorefractive keratectomy (T-PRK), and study their correlation. This is a prospective cohort study including 55 patients (6 male, 49 female, age 25.6±7. Read More

J Refract Surg 2018 Oct;34(10):654-663

Purpose: To assess the visual outcomes, predictability, and safety of the Implantable Collamer Lens (ICL) (STAAR Surgical, Inc., Monrovia, CA) for the management of residual pseudophakic refractive error.

Methods: Forty-nine pseudophakic eyes of 40 patients in which myopic, hyperopic, or toric ICLs were implanted were retrospectively analyzed. 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