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Beyoglu Eye J 2022 27;7(2):121-125. Epub 2022 May 27.

Department of Ophthalmology, University of Health Sciences Beyoglu Eye Training and Research Hospital, Istanbul, Turkey.

Objectives: The aim of the study was to present and compare 2 years results of mechanical photorefractive keratectomy (M-PRK) and transepithelial photorefractive keratectomy (T-PRK) for myopia.

Methods: One hundred and nine eyes of 55 patients were included in this retrospective study. The mean age of the patients was 26. Read More

Int J Ophthalmol 2022 18;15(5):786-792. Epub 2022 May 18.

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

Aim: To investigate the effect of preoperative factors on visual acuity, higher-order aberrations (HOAs), and index of success for spherical change (S.IOS) after transepithelial photorefractive keratectomy (t-PRK) for treating different grades of myopia.

Methods: This was a retrospective one-armed cohort study where patients with high, moderate, or mild myopia treated with single-step t-PRK using Amaris 500 Hz excimer laser were evaluated for visual acuity, refractive status, corneal topography, HOAs, S. Read More

Acta Ophthalmol 2022 May 9. Epub 2022 May 9.

Hospital Lluís Alcanyís, Xàtiva, Spain.

Systematic reviews (SRs) and meta-analyses (MAs) are of great importance for basing clinical decisions. However, misleading interpretations may result when informed decisions rest on biased review papers with methodological issues. To evaluate which treatment is optimal, an overview was made of SRs and MAs to establish the quality and certainty of meta-evidence published on the efficacy of laser-based refractive surgery techniques for treating myopia in adults. Read More

Sci Rep 2022 05 5;12(1):7357. Epub 2022 May 5.

Loma Linda University Eye Institute, 11370 Anderson Street, Suite 1800, Loma Linda, CA, 92354, USA.

To compare the predictive refractive accuracy of intraoperative aberrometry (ORA) to the preoperative Barrett True-K formula in the calculation of intraocular lens (IOL) power in eyes with prior refractive surgery undergoing cataract surgery at the Loma Linda University Eye Institute, Loma Linda, California, USA. We conducted a retrospective chart review of patients with a history of post-myopic or hyperopic LASIK/PRK who underwent uncomplicated cataract surgery between October 2016 and March 2020. Pre-operative measurements were performed utilizing the Barrett True-K formula. Read More

J Healthc Eng 2022 21;2022:2718785. Epub 2022 Apr 21.

Department of Ophthalmology, West China Hospital of Sichuan University, Chengdu, Sichuan, China.

Objective: To determine the effect of aqua astricta flushing on ocular pain after Trans-PRK.

Method: Three hundred and seventy eyes from 185 myopic patients were prospectively recruited for the study. Patients underwent Trans-PRK in both eyes. Read More

J Glaucoma 2022 Jun 8;31(6):406-412. Epub 2022 Apr 8.

Multidisciplinary Department of Medical, Surgical and Dental Sciences, Campania University "Luigi Vanvitelli", Naples, Italy.

Prcis: All devices evaluated in this study showed a significant underestimation in intraocular pressure (IOP) measurement after myopic photorefractive keratectomy (PRK), Goldmann tonometer more than others. Corneal biomechanics indicated a different influence on the different kinds of tonometry.

Purpose: The aim was to investigate the reliability of Goldmann applanation tonometry (GAT), rebound tonometry (RT), ocular response analyzer (ORA), Corvis ST (CST), and dynamic contour tonometry (DCT) in IOP evaluation after myopic PRK. Read More

Eye Contact Lens 2022 Jun 24;48(6):239-241. Epub 2022 Mar 24.

OnO (M.R., A.A.d.B., U.B., D.A.K., N.S.-H.J.B.), Ophthalmology Network Organisation, Clinique de l'Oeil SA, Onex, Geneva, Switzerland; and Miramichi EyeNB Centre of Excellence (N.S.-H.), Miramichi, NB, Canada.

Objectives: To assess the impact of posterior corneal asphericity on postoperative calculation error using the Haigis-L and the Barrett formulas for eyes after laser in situ keratomileusis or photorefractive keratectomy (PRK).

Methods: We assessed the mean absolute error (MAE) of two power calculation formulas, Barrett true-K and Haigis-L formulas, in a retrospective analysis of 34 eyes of 34 patients who underwent cataract surgery. We performed a regression analysis between corneal parameters (anterior and posterior Q values, Kmax, K1, and K2) and the MAE of each formula. Read More

Graefes Arch Clin Exp Ophthalmol 2022 Mar 9. Epub 2022 Mar 9.

NewVision Clinics, Melbourne, Australia.

Purpose: To demonstrate how hemidivisional vector planning of refractive laser treatments of astigmatism can be used to directly address idiopathic corneal irregular astigmatism that has an asymmetrical, non-orthogonal bow tie topography appearance.

Design: Case study.

Methods: The cornea is conceptually divided into two hemidivisions along the flat meridian of the corneal topographic astigmatism (CorT), which means that each hemidivision will approximately correspond to one lobe of the asymmetric, non-orthogonal topographic bow tie. Read More

Clin Ophthalmol 2021 22;15:4775-4785. Epub 2021 Dec 22.

Chiang Mai University LASIK Center, Center for Medical Excellence, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.

Purpose: To evaluate the 12-months outcomes of photorefractive keratectomy (PRK) in patients with high myopia (≥ 6.0 diopters, D) compared with low-to-moderate myopia (< 6.0 D). Read More

Asian J Surg 2022 04 18;45(4):1061-1062. Epub 2022 Feb 18.

Inner Mongolia Medical University, PRK Center, Affiliated Hospital of Inner Mongolia Medical University, Huhehot North Street, Inner Mongolia, 010050, China. Electronic address:

BMC Ophthalmol 2022 Feb 16;22(1):79. Epub 2022 Feb 16.

Department of Surgery, School of Medicine and Hospital Clinic de Barcelona, University of Barcelona (UB), 08036, Barcelona, Spain.

Background: The purpose of this study is to describe measurements using a newly developed modified Goldmann convex tonometer (CT) 1 year after myopic laser refractive surgery. Intraocular pressure (IOP) measurements were compared with IOP values obtained by Goldmann applanation tonometer (GAT), and Ocular Response Analyzer (ORA).

Methods: Prospective double-masked study performed on thirty eyes of thirty patients that underwent laser in situ keratomileusis (LASIK; n = 19) or photorefractive keratectomy (PRK; n = 11). Read More

J Coll Physicians Surg Pak 2022 Mar;32(3):329-334

Department of Community Medicine, Army Medical College, Rawalpindi, Pakistan.

Objectives: To determine the refractive outcomes of wavefront optimized photo refractive keratectomy (PRK) in patients having myopia and myopic astigmatism in terms of efficacy, safety, accuracy, stability and predictability of the procedure.

Study Design: Quasi-experimental study.

Place And Duration Of Study: Refractive Surgical Unit, Armed Forces Institute of Ophthalmology, National University of Medical Sciences, Rawalpindi, Pakistan, from October 2013 to August 2018. Read More

Zhonghua Yan Ke Za Zhi 2022 Feb;58(2):130-136

Department of Ophthalmology, the Third People's Hospital of Dalian, Dalian 116033, China.

To investigate the efficacy of mitomycin C (MMC) 0.02% for prevention of haze after transepithelial photorefractive keratectomy (Trans-PRK) for mild and moderate myopia. Retrospective cohort study. Read More

J Curr Ophthalmol 2021 Oct-Dec;33(4):431-436. Epub 2022 Jan 6.

Department of Ophthalomolgy, AJA University of Medical Sciences, Tehran, Iran.

Purpose: To evaluate the psychometric properties of the Persian version of quality of life impact of refractive correction (QIRC) questionnaire and its utility in assessment of refractive error-related quality of life (QoL) following photorefractive keratectomy (PRK).

Methods: Patients with low-to-moderate myopia (-0.75 to - 6. Read More

Int Ophthalmol 2022 Jan 21. Epub 2022 Jan 21.

Glaucoma Service, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.

Purpose: To evaluate the intraocular pressure (IOP) trend and risk factors for IOP rise after myopic photorefractive keratectomy (PRK).

Patients And Methods: One eye of each patient undergone PRK for myopia was randomly assigned to this study. All eyes underwent tonometry by CorVis Scheimpflug Technology (CST) tonometer (Oculus Optikgeräte GmbH, Wetzlar, Germany) 1 week, 2 weeks, 1 month, 2 months, 3 months and 4 months after surgery. Read More

J Refract Surg 2022 01 1;38(1):21-26. Epub 2022 Jan 1.

Purpose: To describe and compare the cost-effectiveness of small incision lenticule extraction (SMILE), femtosecond laser-assisted in situ keratomileusis (FS-LASIK), and photorefractive keratectomy (PRK) for treating myopia and myopic astigmatism in a private eye center.

Methods: The perspectives for this cost-effectiveness analysis were for the payer and the health care sector. For the payer's perspective, a decision tree model was made, with a time period of 30 years, and the average weighted utility values and quality-adjusted life years (QALY) were computed for each procedure. Read More

J Cataract Refract Surg 2022 Apr;48(4):462-468

From the Aier School of Ophthalmology, Central South University, Changsha, China (Tan, Wang, Peng, Zheng, Lin); Changsha Aier Eye Hospital, Aier Eye Hospital Group, Changsha, China (Tan, Zhao, Peng, Lin); Wuhan Aier Eye Hospital, Aier Eye Hospital Group, Wuhan, China (Wang).

Purpose: To compare the accuracy of intraocular lens (IOL) calculation methods for extended depth-of-focus (EDoF) IOLs in eyes with a history of myopic laser-assisted in situ keratomileusis (LASIK)/photorefractive keratectomy (PRK) surgery lacking historical data.

Setting: Changsha Aier Eye Hospital, Changsha, and Wuhan Aier Eye Hospital, Wuhan, China.

Design: Retrospective case series. Read More

Optom Vis Sci 2022 02;99(2):137-149

The Cornea Institute, L V Prasad Eye Institute, Hyderabad, Telangana, India.

Significance: Psychophysical estimates of spatial and depth vision have been shown to be better after bilateral ReLEx small-incision lenticule extraction (SMILE) refractive surgery for myopia, relative to photorefractive keratectomy (PRK) and femtosecond laser-assisted in situ keratomileusis (FS-LASIK). The present study provides the optical basis for these findings using computational image quality analysis.

Purpose: This study aimed to compare longitudinal changes in higher-order wavefront aberrations and image quality before and after bilateral PRK, FS-LASIK, and SMILE refractive procedures for correcting myopia. Read More

Eye Vis (Lond) 2021 Sep 1;8(1):28. Epub 2021 Sep 1.

Faculty of Medicine, Ophthalmology Department, Suez Canal University, Ring Road, Ismailia, Egypt.

Background: To evaluate predictability, stability, efficacy, and safety of transepithelial photorefractive keratectomy (TPRK) using smart pulse technology (SPT) (SmartSurface procedure) of Schwind Amaris with mitomycin C for correction of post small incision lenticule extraction (SMILE) myopic residual refractive errors.

Method: This study is a prospective, non-comparative case series conducted at a private eye centre in Ismailia, Egypt, on eyes with post-SMILE myopic residual refractive errors because of undercorrection or suction loss (suction loss occurred after the posterior lenticular cut and the creation of side-cuts; redocking was attempted, and the treatment was completed in the same session with the same parameters) with myopia or myopic astigmatism. The patients were followed up post-SMILE for six months before the SmartSurface procedure, and then they were followed up for one year after that. Read More

Indian J Ophthalmol 2022 Jan;70(1):65-70

Optometry Department, College of Applied Medical Science, King Saud University, Jeddah, Kingdom of Saudi Arabia; Department of Ophthalmology, Faculty of Medicine, Cairo University, Giza, Egypt.

Purpose: To compare visual outcomes and vision-related quality of life (VRQoL) between subjects before and after photorefractive keratotomy (PRK) and controls. In addition, VRQoL was compared between subjects at different periods of PRK surgery.

Methods: This was a cross-sectional study that included subjects with refractive errors aged 19-40 years and age-matched controls. Read More

J Refract Surg 2021 Dec 1;37(12):824-829. Epub 2021 Dec 1.

Purpose: To evaluate the safety and efficacy of toric implantable Collamer lens (ICL) (STAAR Surgical) implanted at least 6 months after combined topography-guided photorefractive keratotomy (TG-PRK) and corneal cross-linking (CXL) in keratoconus.

Methods: This retrospective study included 46 eyes with keratoconus of 31 patients who underwent toric ICL implantation after previous TG-PRK+CXL. Patients were examined for uncorrected (UDVA) and corrected (CDVA) distance visual acuity, flat and steep keratometry, and manifest refraction spherical equivalent preoperatively and 12 months postoperatively. Read More

J Ophthalmol 2021 6;2021:3765046. Epub 2021 Dec 6.

Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin 300384, China.

Objective: To compare the corneal asphericity and higher-order aberrations (HOAs) of femtosecond laser-assisted in situ keratomileusis (FS-LASIK) with Smart Pulse Technology (SPT) assisted transepithelial photorefractive keratectomy (Trans-PRK) for myopia and myopic astigmatism correction.

Methods: This prospective study analyzed 88 eyes of 44 patients treated with FS-LASIK and 64 eyes of 32 patients treated with Trans-PRK. All eyes had low to moderate myopia with or without astigmatism (spherical equivalent (SE) <-6. Read More

J Chin Med Assoc 2022 02;85(2):145-151

Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.

Transepithelial photorefractive keratectomy (Trans-PRK), laser-assisted in situ keratomileusis (LASIK), and small incision lenticule extraction (SMILE) are three mainstay refractive surgeries worldwide. The applicability, efficacy, safety, and predictability of these different techniques are quite similar. Trans-PRK has the strongest biostability, earliest return to normal corneal sensitivity but the longest recovery time, most uncomfortable postoperative experience, and possibility of corneal haze. Read More

Indian J Ophthalmol 2021 Dec;69(12):3421-3431

Faculty of Medicine, Al-Azhar University, Cairo; International Medical Research Association (IMedRA), Egypt.

Photorefractive keratectomy (PRK) is considered a safe approach laser procedure with a clinical significance in correcting myopia results. PRK requires removing the whole superficial epithelium. The integrity of the epithelial basement membrane and the deposition of abnormal extracellular matrix can put the cornea in a probable situation for corneal haze formation. Read More

BMC Ophthalmol 2021 Nov 16;21(1):397. Epub 2021 Nov 16.

Department of Ophthalmology, Institute of Vision Research, Yonsei University College of Medicine, 50-1, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.

Background: To investigate the surgical outcomes of implantable collamer lens (ICL) implantation in eyes with residual myopia after primary laser vision correction (LVC) surgeries.

Methods: This study included patients who underwent ICL implantation and had a history of LVC surgery, including photorefractive keratectomy (PRK) or laser-assisted in situ keratomileusis (LASIK). Visual acuity and refractive error were assessed pre and 3-months postoperatively and the efficacy and safety indices calculated accordingly. Read More

Middle East Afr J Ophthalmol 2021 Apr-Jun;28(2):111-115. Epub 2021 Sep 25.

Department of Cataract and Refractive Surgery, L V Prasad Eye Institute, Hyderabad, Telangana, India.

Purpose: The aim of the study was to assess the effect of mitomycin-C (MMC) 0.02% application on corneal endothelium in patients undergoing photorefractive keratectomy (PRK) for the correction of myopia and compound myopic astigmatism.

Methods: A prospective observational study including patients with myopia who underwent PRK plus intraoperative application of MMC 0. Read More

Cornea 2022 Jul 22;41(7):886-893. Epub 2021 Oct 22.

Faculty of Medical and Health Sciences, Department of Ophthalmology, New Zealand National Eye Centre, University of Auckland, Auckland, New Zealand.

Purpose: The aim of this study was to evaluate and compare early corneal biomechanical changes after small-incision lenticule extraction (SMILE) and photorefractive keratectomy (PRK).

Methods: The study comprised 74 patients eligible for refractive surgery, equally allocated to PRK (37 patients) and SMILE (37 patients). Corneal biomechanical properties were recorded and compared between the 2 groups at preoperatively and 3 months after surgery using a dynamic ultra-high-speed Scheimpflug camera equipped with a noncontact tonometer. Read More

Clin Ophthalmol 2021 13;15:4121-4130. Epub 2021 Oct 13.

Department of Ophthalmology, Saint Alphonsus Health System, Boise, ID, USA.

Purpose: Photorefractive keratectomy (PRK) remains a viable, safe, and efficacious option for patients wishing to correct refractive errors. One of its most significant drawbacks is pain. While post-operative pain has been well studied with different management options, intra-operative pain has been less well defined. Read More

Clin Ophthalmol 2021 13;15:4109-4119. Epub 2021 Oct 13.

Department of Ophthalmology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.

Purpose: To compare the visual and refractive results obtained after two-step TransPRK using an EX500 excimer laser for low to moderate myopic correction in adolescents and adults.

Patients And Methods: Retrospectively, 91 eyes of 52 patients were categorized into four groups based on age and level of myopia. The demographics, data of efficacy, safety, predictability, stability, and post-operative complications were evaluated at 1, 3, 6, and 12 months post-operatively. Read More

J Cataract Refract Surg 2021 11;47(11):1411-1416

From the Discipline of Ophthalmology, Sydney Medical School, The University of Sydney, Sydney, Australia (Northey, Moloney); Sydney Eye Hospital, Sydney, Australia (Northey, Moloney); Pacific Laser Eye Centre, Vancouver, British Columbia, Canada (Holland, Lin).

Purpose: To describe a new treatment algorithm aimed at optimizing refractive outcomes for patients with keratoconus and cataract.

Setting: Private practice in Sydney, Australia.

Design: Retrospective case series. Read More