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Riping Zhang, Lixia Sun, Jinyu Li, Antony Law, Vishal Jhanji, Mingzhi Zhang
PURPOSE: To compare the visual and refractive outcomes of transepithelial photorefractive keratectomy (Trans-PRK) and sub-Bowman femtosecond-assisted laser in situ keratomileusis (SBK). SETTING: University hospital. DESIGN: Retrospective, comparative study. METHODS: Two hundred forty patients with myopia and myopic astigmatism underwent SBK (n=157) or Trans-PRK (n=83). The main outcome measures included manifest spherical equivalent refraction (MRSE), logarithm of the minimum angle of resolution uncorrected visual acuity (UCVA), and best-corrected visual acuity (BCVA), which were evaluated at 1 and 3 months postoperatively...
July 30, 2018: Eye & Contact Lens
Diego De Ortueta, Samuel Arba-Mosquera, Thomas Magnago
PURPOSE: To evaluate the temperature rise of human cornea during trans-epithelial photorefractive keratectomy (trans-PRK) with a 750Hz excimer laser employing Intelligent Thermal Effect Control (ITEC) software. METHODS: In this observational case series, trans-PRK ablation was performed on 5 eyes of 3 patients using an aspheric profile of a 750Hz excimer laser system. A high-resolution infrared camera with a frame-rate of 350 images per second was used to determine the corneal surface temperature...
July 20, 2018: Journal of Optometry
Ikhyun Jun, David Sung Yong Kang, Samuel Arba-Mosquera, Jin Young Choi, Hyung Keun Lee, Eung Kweon Kim, Kyoung Yul Seo, Tae-Im Kim
BACKGROUND: To compare the clinical outcomes of wavefront-optimized (WFO) transepithelial photorefractive keratectomy (trans-PRK) and corneal wavefront-guided (CWFG) trans-PRK for myopic eyes with moderate to high astigmatism. METHODS: One hundred ninety-six eyes (196 patients) with moderate to high astigmatism (≥ 1.75 D) treated with WFO or CWFG trans-PRK (101 and 95 eyes, respectively) were retrospectively registered. Safety, efficacy, predictability, vector analysis, and corneal aberrations were compared between groups preoperatively and at 6 months postoperatively...
June 26, 2018: BMC Ophthalmology
Assaf Gershoni, Michael Mimouni, Eitan Livny, Irit Bahar
PURPOSE: The aim of the study was to examine the outcomes of transepithelial photorefractive keratectomy (Trans-PRK) and Femtosecond Laser-assisted in situ keratomileusis (Z-LASIK) for the correction of high myopia. METHODS: A retrospective cohort study design was used. The study group included 792 eyes with high-grade myopia (- 6.0 diopters or higher) or high-grade myopia with astigmatism that were treated with Z-LASIK or Trans-PRK in 2013 through 2014 in an optical outpatient clinic of a large private medical service...
March 12, 2018: International Ophthalmology
Igor M Kornilovskiy, Elmar M Kasimov, Ayten I Sultanova, Alexander A Burtsev
AIM: To estimate the biomechanical effect of the laser-induced cross-linking resulting from photorefractive ablation of the cornea with riboflavin. METHODS: Excimer laser ablation studies were performed ex vivo (32 eyes of 16 rabbits) by phototherapeutic keratectomy (PTK) and in vivo (24 eyes of 12 rabbits) by transepithelial photorefractive keratectomy (TransPRK), with and without riboflavin saturation of the stroma. Then, we performed corneal optical coherence tomography on 36 eyes of 18 patients with varying degrees of myopia at different times after the TransPRK was performed with riboflavin saturation of the stroma...
2016: Clinical Ophthalmology
M A Stepanova, E N Arkhipova, Yu S Medvedeva, M Yu Karganov, E N Eskina
The method of laser correlation spectroscopy (LCS) was used for the examination of the subfractional compound of tear fluid in patients who have been using soft contact lens (SCL) for a long period and before and after the excimer laser correction with transepithelial photorefractive keratectomy (Trans PRK). Based on the analysis of biological material of 141 patients aged from 18 to 33 years old, we can conclude that prolonged usage of SCL leads to catabolic processes in surface of the anterior segment of the eye and, as a result, to changes in the qualitative composition of the tear fluid...
January 2014: Patologicheskaia Fiziologiia i èksperimental'naia Terapiia
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