758 results match your criteria Myopia Radial Keratotomy


[Radial keratotomy: history and current state].

Authors:
S E Avetisov

Vestn Oftalmol 2021 ;137(2):123-131

Research Institute of Eye Diseases, Moscow, Russia.

Results of clinical use of the radial keratotomy (RK) surgery are presented in the format of a lecture and a summary. The analysis encompasses the mechanism of changes in corneal refraction, immediate intra- and postoperative complications, so-called secondary symptoms and long-term effects (addition of various pathological processes, influence of corneal changes on the results of diagnostic tests and treatment methods) of the surgery. Read More

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Biology of keratorefractive surgery- PRK, PTK, LASIK, SMILE, inlays and other refractive procedures.

Authors:
Steven E Wilson

Exp Eye Res 2020 09 10;198:108136. Epub 2020 Jul 10.

Cole Eye Institute, I-32, Cleveland Clinic, 9500, Euclid Ave, Cleveland, OH, United States. Electronic address:

The outcomes of refractive surgical procedures to improve uncorrected vision in patients-including photorefractive keratectomy (PRK), laser in-situ keratomileusis (LASIK), Small Incision Lenticule Extraction (SMILE) and corneal inlay procedures-is in large part determined by the corneal wound healing response after surgery. The wound healing response varies depending on the type of surgery, the level of intended correction of refractive error, the post-operative inflammatory response, generation of opacity producing myofibroblasts and likely poorly understood genetic factors. This article details what is known about these specific wound healing responses that include apoptosis of keratocytes and myofibroblasts, mitosis of corneal fibroblasts and myofibroblast precursors, the development of myofibroblasts from keratocyte-derived corneal fibroblasts and bone marrow-derived fibrocytes, deposition of disordered extracellular matrix by corneal fibroblasts and myofibroblasts, healing of the epithelial injury, and regeneration of the epithelial basement membrane. Read More

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September 2020

Refractive surgery in the HIV-positive U.S. Military Natural History Study Cohort: complications and risk factors.

J Cataract Refract Surg 2019 11 1;45(11):1612-1618. Epub 2019 Oct 1.

Department of Ophthalmology, Brooke Army Medical Center, San Antonio, Texas, USA; Department of Surgery, Uniformed Services University of the Health Science, Bethesda, Maryland, USA.

Purpose: This study sought to assess the frequency of refractive surgery complications in HIV+ individuals and related risk factors.

Settings: Multiple centers in the United States.

Design: Prospective observational cohort study. Read More

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November 2019

Evaluation of total keratometry and its accuracy for intraocular lens power calculation in eyes after corneal refractive surgery.

J Cataract Refract Surg 2019 10 6;45(10):1416-1421. Epub 2019 Aug 6.

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

Purpose: To compare the accuracy of total keratometry (TK) and standard keratometry (K) from a swept-source optical coherence tomography biometer for intraocular lens (IOL) power calculation in eyes with previous corneal refractive surgery.

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

Design: Retrospective case series. Read More

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October 2019

[Photorefractive Keratectomy (PRK) as a Procedure for Correction of Residual Refractive Errors after Radial Keratotomy].

Klin Monbl Augenheilkd 2020 Aug 2;237(8):961-967. 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

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Lensectomy after radial keratotomy: 1-year follow-up.

Int Ophthalmol 2019 Nov 11;39(11):2561-2568. Epub 2019 Apr 11.

Fernández-Vega Ophthalmological Institute, Avda. Dres. Fernández-Vega 114, 33012, Oviedo, Spain.

Purpose: To report visual and refractive results in radial keratotomy (RK) patients that underwent a cataract surgery with a monofocal intraocular lens (IOL) implantation with 1 year of follow-up.

Methods: Twenty-eight eyes of 15 patients with cataract and the previous RK were included. All eyes underwent phacoemulsification and monofocal IOL implantation. Read More

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November 2019

Refractive correction with multifocal intraocular lenses after radial keratotomy.

Eye (Lond) 2019 06 15;33(6):1000-1007. Epub 2019 Feb 15.

Optics and Optometry and Vision Sciences Department, Faculty of Physics, University of Valencia, Valencia, Spain.

Purpose: To assess visual and refractive results of multifocal intraocular lens (IOLs) implantation for refractive correction after radial keratotomy (RK).

Methods: In a retrospective non-comparative interventional case series, we analyzed the outcomes of multifocal IOL implantation performed in the context of cataract or refractive lens exchange surgery following RK. A total of 17 eyes from nine patients were included in the study. Read More

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Implantable Collamer Lens for Management of Pseudophakic Ametropia in Eyes With a Spectrum of Previous Corneal Surgery.

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

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October 2018

A Case of Late Spontaneous Post-Radial Keratotomy Corneal Perforation Managed With Specialty Lenses.

Eye Contact Lens 2018 Sep;44 Suppl 1:S341-S344

Department of Ophthalmology (J.V.d.H., K.B., L.A., M.V.H., C.K.), Antwerp University Hospital, Antwerp, Belgium; Faculty of Medicine and Health Sciences (J.V.d.H., K.B., C.K.), University of Antwerp, Antwerp, Belgium; and Lens Optical Technology (L.A., M.V.H.), Lommel, Belgium.

Purpose: To describe a case of spontaneous wound dehiscence 29 years after radial keratotomy (RK) and to illustrate how specialty contact lenses were used for tectonic support and optic correction.

Setting: Tertiary referral center for corneal pathology.

Design: Case report. Read More

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September 2018

Corneal hysteresis in post-radial keratotomy primary open-angle glaucoma.

Graefes Arch Clin Exp Ophthalmol 2018 Oct 23;256(10):1971-1976. Epub 2018 Jul 23.

Little Rock Eye Clinic, 201 Executive Court, Little Rock, AR, 72205, USA.

Purpose: Corneal hysteresis (CH) is a corneal biomechanical property measured by the ocular response analyzer (ORA). It is associated with primary open-angle glaucoma development, progression, and severity as well as intraocular pressure (IOP) measurement. Decreases in CH and changes in IOP measurements have been described for laser-assisted refractive surgery; however, patients with prior radial keratotomy (RK) have not been examined. Read More

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October 2018

Expulsive aniridia following remote radial keratotomy.

Can J Ophthalmol 2018 04 28;53(2):e50-e52. Epub 2017 Sep 28.

Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ont. Electronic address:

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Biomechanical Simulation of Stress Concentration and Intraocular Pressure in Corneas Subjected to Myopic Refractive Surgical Procedures.

Sci Rep 2017 10 24;7(1):13906. Epub 2017 Oct 24.

Department of Mechanical Engineering, National Taiwan University, 10617, Taipei, Taiwan.

Recent advances in the analysis of corneal biomechanical properties remain difficult to predict the structural stability before and after refractive surgery. In this regard, we applied the finite element method (FEM) to determine the roles of the Bowman's membrane, stroma, and Descemet's membrane in the hoop stresses of cornea, under tension (physiological) and bending (nonphysiological), for patients who undergo radial keratotomy (RK), photorefractive keratectomy (PRK), laser-assisted in situ keratomileusis (LASIK), or small incision lenticule extraction (SMILE). The stress concentration maps, potential creak zones, and potential errors in intraocular pressure (IOP) measurements were further determined. Read More

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October 2017

Implantation of a Multifocal Toric Intraocular Lens after Radial Keratotomy and Cross-Linking with Hyperopia and Astigmatism Residues: A Case Report.

Case Rep Ophthalmol 2017 May-Aug;8(2):440-445. Epub 2017 Aug 29.

Institute of Ophthalmology, Department of Surgical Sciences, University of Turin, Turin, Italy.

Radial keratotomy is a refractive surgical technique, widely used in the 80s and early 90s to correct myopia and astigmatism, but now overcome by more recent laser techniques. Important consequences, often in patients with more than 45 years of age, are progressive hyperopic shift and/or an increase in corneal astigmatism, whose main cause seems to be an increase in the curvature radius of the central portion of the cornea. This seems to be due to radial keratotomy incisions - with the consequent need for cross-linking - intraocular pressure, and corneal biomechanical parameters. Read More

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Correction of hyperopia with astigmatism following radial keratotomy with daily disposable plus spherical contact lens: a case report.

Int Ophthalmol 2018 Oct 30;38(5):2199-2204. Epub 2017 Aug 30.

Department of Ophthalmology, LinKo Chang Gung Memorial Hospital, Chang Gung University College of Medicine, No.5, Fuxing St., Guishan Dist., Taoyuan City, 333, Taiwan.

Purpose: To report the refractive correction in a case of hyperopia and astigmatism following radial keratotomy.

Methods: A case report.

Results: A 47-year-old woman, who had undergone refractive surgery for radial keratotomy in both eyes 22 years before the present study, presented to our clinic with blurred vision. Read More

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October 2018

Implantation of Implantable Collamer Lenses After Radial Keratotomy.

J Refract Surg 2017 Jun;33(6):395-398

Purpose: To assess the predictability, efficacy, and safety of posterior chamber phakic implantable collamer lens (ICL) implantation after radial keratotomy.

Methods: In a retrospective non-comparative interventional case series, outcomes in 6 consecutive eyes of 4 patients with residual refraction after radial keratotomy were analyzed after the implantation of ICLs. All of the lenses were implanted to correct the residual refractive error, ranging from -12. Read More

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[Intraocular pressure measurement inside the anterior chamber: a new technical solution and results].

Vestn Oftalmol 2016;132(6):4-10

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

Aim: To develop a new manometric device for intravital measurement of intraocular pressure (IOP) in the anterior chamber and to assess tonometric data reliability, including post-radial keratotomy (RK) measurements.

Material And Methods: The experiment was conducted in 2 isolated cadaver eyes, while the clinical study enrolled 20 patients (21 eyes) scheduled for cataract phacoemulsification surgery. Of them, 10 patients (10 eyes) with immature cataract and mild to moderate myopia constituted the control group. Read More

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Implantable collamer lens for residual refractive error after corneal refractive surgery.

Int J Ophthalmol 2016 18;9(10):1421-1426. Epub 2016 Oct 18.

Myopia Key Laboratory of the Health Ministry, Shanghai 200031, China; Department of Ophthalmology, EYE and ENT Hospital of Fudan University, Shanghai 200031, China.

Aim: To assess the safety, efficacy, predictability and stability of implantable collamer lens (ICL) for residual refractive error after corneal refractive surgery.

Methods: This study evaluated 19 eyes of 12 patients who underwent ICL implantation after corneal refractive surgeries. They were followed up for 1y to 5y of uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refractive error, flat and steep K value, axial length, intraocular pressure, corneal endothelial cell density, adverse events after ICL surgery. Read More

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October 2016

Comparison of Newer IOL Power Calculation Methods for Eyes With Previous Radial Keratotomy.

Invest Ophthalmol Vis Sci 2016 07;57(9):OCT162-8

Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, United States.

Purpose: To evaluate the accuracy of the optical coherence tomography-based (OCT formula) and Barrett True K (True K) intraocular lens (IOL) calculation formulas in eyes with previous radial keratotomy (RK).

Methods: In 95 eyes of 65 patients, using the actual refraction following cataract surgery as target refraction, the predicted IOL power for each method was calculated. The IOL prediction error (PE) was obtained by subtracting the predicted IOL power from the implanted IOL power. Read More

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Multifocal Intraocular Lens Results in Correcting Presbyopia in Eyes After Radial Keratotomy.

Eye Contact Lens 2017 Nov;43(6):e22-e25

Department of Ophthalmology (K.H.K., W.S.K.), Haeundae Paik Hospital, Busan, South Korea; Department of Ophthalmology (K.H.K, W.S.K.), Inje University College of Medicine, Busan, South Korea; and Center for Cataract and Presbyopia (K.-w.S.), Balgeunsesang Eye Clinic, Busan, South Korea.

Objectives: To report results of multifocal intraocular lens (IOL) implantation in 2 patients with refractive error and presbyopia after previous radial keratotomy (RK).

Methods: A refractive multifocal IOL with rotational asymmetry (LS313-MF30; Oculentis, Berlin, Germany) was implanted.

Results: The first patient was a 60-year-old man with myopia who underwent unilateral RK 20 years before. Read More

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November 2017

Femtosecond-assisted laser in situ keratomileusis for consecutive hyperopia after radial keratotomy.

J Cataract Refract Surg 2015 Aug;41(8):1594-601

From the Siena Eye Laser (Leccisotti, Fields), Poggibonsi, Siena, Italy; the School of Biomedical Sciences (Leccisotti), University of Ulster, Coleraine, United Kingdom.

Purpose: To evaluate femtosecond-assisted laser in situ keratomileusis (LASIK) for the treatment of hyperopic shift after radial keratotomy (RK).

Setting: Private practice, Siena, Italy.

Design: Prospective case series. Read More

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[Cataract surgery and intraocular lens power calculation after radial keratotomy: analysis of 8 cases].

Nan Fang Yi Ke Da Xue Xue Bao 2015 Jul;35(7):1043-4

Department of Ophthalmology, Fourth Affiliated Hospital, West China Medical Center, Sichuan University, Chengdu 610021, China.E-mail:

Objective: To explore the clinical characteristics of cataract surgery after radial keratotomy (RK) and appropriate calculation of intraocular lens (IOL) power.

Methods: Eight patients with cataract (12 eyes) after RK were treated in our hospital from March, 2010 to June, 2013. The visual acuity, keratometric power and length of the ocular axis were examined before the operation. Read More

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Wavefront-Guided Laser Treatment Using a High-Resolution Aberrometer to Measure Irregular Corneas: A Pilot Study.

J Refract Surg 2015 Jun;31(6):411-8

Purpose: To evaluate in a pilot study the visual, refractive, corneal topographic, and aberrometric changes after wavefront-guided LASIK or photorefractive keratectomy (PRK) using a high-resolution aberrometer to calculate the treatment for aberrated eyes.

Methods: Twenty aberrated eyes of 18 patients undergoing wavefront-guided LASIK or PRK using the VISX STARS4IR excimer laser and the iDesign aberrometer (Abbott Medical Optics, Inc., Santa Ana, CA) were enrolled in this prospective study. Read More

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Long-Term Outcomes of Radial Keratotomy, Laser In Situ Keratomileusis, and Astigmatic Keratotomy Performed Consecutively over a Period of 21 Years.

Case Rep Ophthalmol Med 2015 19;2015:592495. Epub 2015 Mar 19.

University of Miami Miller School of Medicine, Bascom Palmer Eye Institute, Miami, FL 33136, USA ; Ophthalmic Biophysics Center, McKnight Vision Center, Miami, FL 33136, USA.

Unlabelled: Purpose. To describe a case of 3 refractive procedures performed in one eye over 2 decades. Methods. Read More

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Multifocal Corneal Excimer Femtosecond Laser in situ Keratomileusis following Radial Keratotomy: A Case Report with Six Months of Follow-Up.

Case Rep Ophthalmol 2014 Sep 3;5(3):423-8. Epub 2014 Dec 3.

Swiss Eye Research Foundation, ORASIS Eye Clinic, Reinach, Switzerland ; University of Novi Sad, Faculty of Physics, Novi Sad, Serbia ; Medical Faculty, Military Medical Academy, University of Defense, Belgrade, Serbia.

We report the case of a 46-year-old female patient who was referred to our clinic (Orasis Eye Clinic, Reinach, Switzerland) seeking improvement of her distance and near visual acuity. Radial keratotomy (RK) was performed at a younger age on both eyes to correct -5 D myopia. The patient underwent a bilateral same-session multifocal corneal excimer femtosecond laser (Supracor) keratomileusis correction. Read More

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September 2014

Acute hydrops with secondary bacterial keratitis: sequelae of paediatric refractive surgery.

Int Ophthalmol 2014 Dec 5;34(6):1275-8. Epub 2014 Sep 5.

Cornea & Refractive Surgery Services, Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India.

A 24-year-old male patient with bilateral high myopia presented to our outpatient department with sudden onset of pain and diminution of vision in his right eye. He had sequentially undergone bilateral trabeculectomy and photorefractive keratectomy at the age of 6 years in both eyes. This was followed by radial keratotomy in right eye at the age of 8 years. Read More

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December 2014

Accuracy and stability of hyperopic treatments.

Authors:
Bryan S Lee

Curr Opin Ophthalmol 2014 Jul;25(4):281-5

University of Washington, Seattle, Washington, USA.

Purpose Of Review: Treatment of hyperopia presents greater challenges than treatment of myopia for multiple reasons, including the fact that hyperopia tends to progress with age and becomes more symptomatic with the loss of accommodation.

Recent Findings: Despite these issues, surgeons have multiple options to treat hyperopia successfully. Modern laser vision correction has high success rates for most patients and performs acceptably in the presence of high hyperopia or high cylinder. Read More

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Manual intrastromal corneal keratotomy: An alternate encouraging approach for refractive error correction.

Oman J Ophthalmol 2014 Jan;7(1):28-32

Department of Refractive Surgery, Sri Venkateshwara Nethralaya, Bangalore, Karnataka, India.

Results of femtosecond based intrastromal astigmatic keratotomy have been reported to be encouraging for correction of Astigmatism. We report a new surgical technique-manual intrastromal corneal keratotomy (MICK) for correction of simple refractive astigmatism (-1.5 DC against the rule). Read More

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January 2014