604 results match your criteria Astigmatism PRK

One-year follow-up of patients with hyperopia undergoing photorefractive keratectomy with Allegretto WaveLight Eye Q 400.

J Med Life 2022 Apr;15(4):489-498

Department of Community Medicine, Ardabil University of Medical Sciences, Ardabil, Iran.

This study aimed to examine the effectiveness of photorefractive keratectomy (PRK) in treating patients with cycloplegic hyperopia from +1.00 to +7.00 diopter using Allegretto wave Eye Q 400. Read More

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Correction of pre-existing astigmatism with phacoemulsification using toric intraocular lens versus spherical intraocular lens and wave front guided surface ablation.

BMC Ophthalmol 2022 Mar 12;22(1):114. Epub 2022 Mar 12.

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

Background: This study aimed to evaluate toric intraocular lens to correct of pre-existing astigmatism at the time of phacoemulsification compared to using of spherical intraocular lens followed by wavefront guided surface ablation.

Results: The patients were classified into three groups: Group A with 20 eyes of 19 patients having phacoemulsification with spherical intraocular lens only as a control group, group B with 20 eyes of 14 patients had phacoemulsification with toric intraocular lens and group C with 20 eyes of 16 patients had phacoemulsification with spherical intraocular lens and wavefront guided PRK three months later. Comparison pre-operative data for all groups showed no statistically significant difference regarding UCVA, BCVA, MRSE, and refractive astigmatism (P>0. Read More

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Hemidivisional vector planning to reduce and regularize irregular astigmatism by laser treatment.

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

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Comparison of transepithelial and conventional photorefractive keratectomy in myopic and myopic astigmatism patients: a randomized contralateral trial.

BMC Ophthalmol 2022 Feb 11;22(1):68. Epub 2022 Feb 11.

Noor Ophthalmology Research Center, Noor Eye Hospital, 96, Esfandiar Blvd, Valiasr St, Tehran, Tehran, 1968653111, Iran.

Background: To assess transepithelial photorefractive keratectomy (tPRK) in terms of corneal epithelial healing rate, postoperative pain, postoperative discomfort, and visual and refraction outcomes compared to mechanical epithelial debridement PRK (mPRK) and alcohol-assisted PRK (aaPRK).

Methods: In this double-masked, randomized clinical trial, thirty-nine patients underwent tPRK in one eye and mPRK in the fellow eye (arm A), and 33 patients underwent tPRK in one eye and aaPRK in the contralateral eye (arm B). All surgical procedures were done using the Schwind Amaris excimer laser. Read More

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February 2022

Assessment of Refractive Outcome of Photo Refractive Keratectomy in Myopia and Myopic Astigmatism.

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

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Intrastromal corneal ring segments followed by photorefractive keratectomy for high post-keratoplasty astigmatism: A prospective study.

J Cataract Refract Surg 2022 Jan 18. Epub 2022 Jan 18.

University of São Paulo - USP, São Paulo, Brazil. INOB Eye Hospital, Brasília, Brazil. Hospital de Base, Brasília, Brazil. Hospital Oftalmológico de Brasília, Brasília, Brazil.

Purpose: To evaluate refractive and topographic results of the association of intrastromal corneal ring segments (ICRS) with photorefractive keratectomy (PRK) for the correction of high (> 6.0 D) post-keratoplasty astigmatism.

Setting: University of São Paulo. Read More

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January 2022

Treatment of Corneal Irregularity in Radial/Astigmatic Keratotomy Patients Utilizing WaveLight Contoura.

Manoj Motwani

Clin Ophthalmol 2022 11;16:111-126. Epub 2022 Jan 11.

Motwani LASIK Institute, San Diego, CA, 92121, USA.

Purpose: To demonstrate the treatment of radial keratotomy-induced corneal irregularity with topographic-guided ablation (WaveLight Contoura).

Methods: Thirty-two eyes of 18 patients were treated for corneal irregularity post-radial keratotomy with WaveLight Contoura topographic-guided ablation utilizing LASIK and PRK and the San Diego Protocol for reconstructing corneas. These eyes were followed for six-months. Read More

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January 2022

Comparison of the Cost-Effectiveness of SMILE, FS-LASIK, and PRK for Myopia in a Private Eye Center in Spain.

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

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January 2022

SmartSurf transepithelial photorefractive keratectomy with mitomycin C enhancement after small incision lenticule extraction.

Amr A Gab-Alla

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

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September 2021

Visual and Refractive Outcomes of Toric Implantable Collamer Lens Implantation in Stable Keratoconus After Combined Topography-Guided PRK and CXL.

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

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December 2021

Corneal Asphericity and Higher-Order Aberrations after FS-LASIK and Trans-PRK for Myopia.

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

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December 2021

Comparison of clinical outcomes of LASIK, Trans-PRK, and SMILE for correction of myopia.

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

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February 2022

A Prospective Evaluation of the Effect of Mitomycin-C on Corneal Endothelium after Photorefractive Keratectomy for Myopia Correction.

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

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November 2021

Two-Step Transepithelial Photorefractive Keratectomy with WaveLight EX500 Platform for Adolescents and Adults with Low to Moderate Myopia: A 12-Month Comparative Evaluation.

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

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October 2021

Topography-Guided Trans-Epithelial No-Touch Photorefractive Keratectomy for High Irregular Astigmatism After Penetrating Keratoplasty: A Prospective 12-Months Follow-Up.

Ther Clin Risk Manag 2021 24;17:1027-1035. Epub 2021 Sep 24.

Eye Clinic, Policlinico Umberto 1, "Sapienza" University of Rome, Rome, Italy.

Purpose: To describe the efficacy and safety of topography-guided trans-epithelial no-touch photorefractive keratectomy (PRK) for the correction of highly irregular astigmatism after penetrating keratoplasty (PK).

Patients And Methods: A prospective study was conducted on 12 eyes of 12 patients affected by highly irregular astigmatism after PK for keratoconus. Each patient underwent a single-step topography-guided trans-epithelial ablation (CIPTA2 software, iVis Technologies). Read More

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September 2021

Public Interest in Refractive Diseases and Treatments During the COVID-19 Pandemic: A Google Trends Analysis.

Cureus 2021 Aug 15;13(8):e17207. Epub 2021 Aug 15.

Ophthalmology, George Washington University School of Medicine and Health Sciences, Washington DC, USA.

Purpose To assess national internet search trends/public interest in refractive diseases and treatments during the first year of the COVID-19 pandemic. Methods A Google Trends search for refractive terms was performed during the first year of the COVID-19 pandemic. Refractive terms were divided into disease and treatment terms. Read More

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[Combined transepithelial PTK and topography-guided PRK for treatment of trauma-related corneal scarring].

Ophthalmologe 2022 Mar 25;119(3):250-257. Epub 2021 Aug 25.

Universitäts-Augenklinik, Medizinische Universität, Graz, Österreich.

Background: Corneal scars can severely impair visual performance and treatment can be challenging. The study aimed to evaluate a promising minimally invasive option in the treatment of corneal scars using transepithelial topography-guided ablation.

Methods: This retrospective interventional study involved four eyes of four patients who developed corneal scarring and irregular surfaces due to trauma and were treated with topography-guided photorefractive keratectomy (TG-PRK) between 2017 and 2020. Read More

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Toric Implantable Collamer Lens for the Treatment of Myopic Astigmatism.

Clin Ophthalmol 2021 6;15:2893-2906. Epub 2021 Jul 6.

Hoopes Vision Research Center, Hoopes Vision, Draper, UT, 84020, USA.

Purpose: To report visual outcomes following surgical correction of myopic astigmatism with Visian Toric implantable collamer lens (ICL) (STAAR Surgical, Monrovia, CA, USA) at a single tertiary refractive center in the United States.

Patients And Methods: Toric ICL was implanted in 96 eyes (55 patients) with mean preoperative sphere of -8.98 ± 3. Read More

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Centration of myopic refractive ablation: should we center treatment on the pupil or the visual axis?

Lasers Med Sci 2021 Oct 29;36(8):1733-1739. Epub 2021 Jun 29.

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

The purpose of this study is to compare pupil versus corneal vertex-centered ablation for myopic laser refractive surgery. This study is a retrospective case series of right eyes of consecutive myopic patients undergoing either photorefractive keratectomy (PRK) or laser-assisted in situ keratomileusis (LASIK) with pupil or corneal vertex-centered ablation from January 2018 to April 2018. Overall 258 eyes of 258 patients were included. Read More

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October 2021

Factors Predicting the Need for Re-treatment After Laser Refractive Surgery in Patients With High Astigmatism: A Large Database Analysis.

J Refract Surg 2021 Jun 1;37(6):366-371. Epub 2021 Jun 1.

Purpose: To identify the potential risk factors that increase the likelihood of requiring re-treatment following refractive surgery in patients with high astigmatism (3.00 diopters or greater).

Methods: This retrospective study included patients who underwent laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK) between January 2005 and December 2019 at the Care-Vision Laser Centers, Tel-Aviv, Israel. Read More

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Treatment of Keratoconus with WaveLight Contoura and Corneal Cross-Linking Combined.

Manoj Motwani

Clin Ophthalmol 2021 14;15:2455-2472. Epub 2021 Jun 14.

Motwani LASIK Institute, San Diego, CA, 92121, USA.

Purpose: To investigate the outcomes of the treatment of keratoconus/corneal ectasia utilizing topographic-guided ablation (WaveLight Contoura) followed by corneal cross-linking.

Methods: Thirty-six eyes of 21 patients were treated for keratoconus/corneal ectasia utilizing topographic guided ablation photorefractive keratectomy (PRK) for treatment of corneal higher-order aberrations and refractive error followed immediately by 15-minute cross-linking were examined retrospectively. Six-month results were analyzed via measurement of vision, refraction, residual higher-order aberrations (HOAs), residual lower-order and higher-order aberrations, as well as for loss or gains of lines of best-corrected visual acuity. Read More

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Long-Term Follow-Up of Combined Photorefractive Keratectomy and Corneal Crosslinking in Keratoconus Suspects.

Clin Ophthalmol 2021 9;15:2403-2410. Epub 2021 Jun 9.

Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland.

Purpose: To present the long-term outcomes of photorefractive keratectomy (PRK) combined with accelerated corneal cross-linking (CXL) for refractive error correction in a series of keratoconus suspects.

Setting: University practice.

Design: Retrospective case series. Read More

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Factors associated with changes in posterior corneal surface following photorefractive keratectomy.

Graefes Arch Clin Exp Ophthalmol 2021 Nov 7;259(11):3477-3483. Epub 2021 Jun 7.

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

Purpose: To identify factors associated with changes in the posterior cornea curvature following laser refractive surgery.

Materials And Methods: This retrospective study included myopic astigmatic eyes that underwent PRK between January 2013 and December 2013 at Care-Vision Laser Centers, Tel-Aviv, Israel. The average posterior K was measured with the Sirius device at a radius of 3 mm from the center. Read More

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November 2021

Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism.

Clin Ophthalmol 2021 23;15:1735-1749. Epub 2021 Apr 23.

Ophthalmology Department, Cairo University, Cairo, Egypt.

Purpose Of The Study: To compare visual outcome, higher order aberrations (HOAs) of topography guided and Q value adjusted ablation in the fellow eye of patients undergoing photorefractive keratectomy (PRK) for the correction of myopia and myopic astigmatism.

Methods: Prospective randomized controlled interventional clinical study. The eyes of 52 patients undergoing PRK for myopia and astigmatism were included, that is, 104 eyes in total. Read More

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Early clinical outcomes and comparison between trans-PRK and PRK, regarding refractive outcome, wound healing, pain intensity and visual recovery time in a real-world setup.

Harald C Gaeckle

BMC Ophthalmol 2021 Apr 16;21(1):181. Epub 2021 Apr 16.

Augenlaserzentrum Neu-Ulm, Edisonallee 19, 89231, Neu-Ulm, Germany.

Purpose: To compare early clinical outcomes of single-step transepithelial photorefractive keratectomy (tPRK) and photorefractive keratectomy (PRK) regarding refractive outcome, visual acuity, wound healing, pain intensity and visual recovery time.d.

Methods: In this prospective clinical observational study 200 eyes of 100 consecutive patients with mild to moderate myopia with or without mild astigmatism were included. Read More

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[Refractive surgery for hyperopia].

J Fr Ophtalmol 2021 May 6;44(5):723-729. Epub 2021 Apr 6.

Service d'ophtalmologie, Hôpital d'instruction des Armées Percy, 101, avenue Henri-Barbusse, BP 406, 92141 Clamart cedex, France; École du Val-de-Grâce, 1, place Alphonse-Laveran, 75230 Paris cedex 05, France.

Hyperopia is a refractive error in which light is focused behind, instead of on, the retina. Clear vision can be obtained by accommodation, but in the long run, this results in eye strain. Hyperopia can be classified as low [≤2. Read More

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Transepithelial photorefractive keratectomy to treat mild myopia.

Int Ophthalmol 2021 Jul 24;41(7):2575-2583. Epub 2021 Mar 24.

Department of Ophthalmology, College of Medicine, King Saud University, Airport Road, P.O. Box 245, Riyadh, 11411, Saudi Arabia.

Purpose: To assess the safety and effectiveness of transepithelial photorefractive keratectomy (T-PRK) in patients with mild myopia using the Schwind Amaris 750 s Excimer laser system which take corneal epithelium variability in consideration during ablation.

Methods: A prospective case series study of patients with mild myopia with or without astigmatism (spherical equivalent ≤ -3 diopters), who underwent T-PRK as a single-step treatment, was carried out at King Abdulaziz University Hospital, Riyadh between May 2017 and January 2018. The main outcomes included postoperative uncorrected distance visual acuity (UDVA), residual refraction (manifest refraction) and complications. Read More

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LASIK versus PRK for high astigmatism.

Int Ophthalmol 2021 Jun 22;41(6):2091-2098. Epub 2021 Mar 22.

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

Purpose: To compare the refractive outcomes of laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) for myopic astigmatism of 3 diopters (D) or more.

Study Design: Retrospective matched comparative study.

Methods: This study include consecutive myopic patients (SE 0 to -10 D) undergoing LASIK or PRK between 2007 and 2016 with astigmatism of 3 to 6 D, and postoperative follow-up of at least 30 days for LASIK and 60 days for PRK, compared outcomes of LASIK and PRK eyes. Read More

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Benefits of autologous platelet tissue graft in wound healing after corneal refractive surgery: a case report.

J Med Case Rep 2021 Mar 16;15(1):122. Epub 2021 Mar 16.

Takayanagi EYE Clinic, Sapporo S1 Building 3F, Nishi4-20-5, Minami1-jo, Chuo-ku, Sapporo, Hokkaido, 060-0807, Japan.

Background: Corneal refractive surgeries cause epithelial damage and induce wound healing processes. To promote wound healing after photorefractive keratectomy, the effectiveness of an autologous platelet tissue graft was assessed.

Case Presentation: A 45-year-old Asian male with low myopia and/or myopic astigmatism received photorefractive keratectomy in both eyes. Read More

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Epi-Bowman keratectomy versus alcohol-assisted photorefractive keratectomy: wound healing and complications.

Ther Adv Ophthalmol 2021 Jan-Dec;13:2515841420988215. Epub 2021 Jan 22.

University Eye Hospital, Ruhr-University Bochum, Bochum, Germany.

Purpose: In Epi-Bowman Keratectomy™ (EBK), a new dynamic multi-blade single-use device (Epi-Clear™, Orca Surgical, Israel) is utilized to remove the epithelium by sweeping movements across the corneal surface. Epithelial cells are discarded. Alcohol or other chemical agents are not utilized. Read More

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January 2021