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Auteur Sujata Rijal
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Ajouter le résultat dans votre panier Affiner la rechercheQuantifying the Optical and Physical Consequences of Daily Cleaning on Conventional and Wavefront-guided Scleral Lenses / Sarah M. Horwitz in OVS : Optometry & Vision Science, vol. 97, 09 (Septembre 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 09 (Septembre 2020)
Titre : Quantifying the Optical and Physical Consequences of Daily Cleaning on Conventional and Wavefront-guided Scleral Lenses Type de document : article de périodique Auteurs : Sarah M. Horwitz ; Gareth D. Hastings ; Lan Chi Nguyen ; Matthew J. Kauffman ; Chuan Hu ; Sujata Rijal Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus HELB]:Paramédical:Lentille scérale
[Thésaurus Mesh]Solutions ophtalmiques
[Thésaurus Mesh]Tests de visionRésumé : SIGNIFICANCE: An equivalent 12 months of cleaning did not induce significant changes in the optical aberrations or base curves of scleral lenses. PURPOSE: This study aimed to test whether an equivalent of 12 months of manual cleaning alters the optical and physical properties of conventional and wavefront-guided scleral lenses. METHODS: Twelve scleral lenses (four repeats of three designs, termed A, B, and C) were manufactured in Boston XO material: design A, −5.00 D defocus; design B, −5.00 D defocus with −0.153-μm vertical coma; and design C, −5.00 D defocus with a full custom wavefront-guided correction (second to fifth Zernike radial orders) of an eye with severe keratoconus. One lens of each design group served as a control and was not cleaned. To simulate a year of cleaning, seven individuals cleaned nine lenses (three from each group) twice a day for 27 days using the palm technique and commercially available cleaners, resulting in 378 cleanings of each lens. Lens aberrations were optically profiled and base curve radii were measured at baseline and after every 42nd cleaning. Differences in higher-order root mean square (HORMS) wavefront error and base curve radii associated with cleaning were compared with clinical benchmarks and using sign tests. RESULTS: For the experimental lenses, median change in Seidel spherical dioptric power was +0.01 D (maximum, +0.025 D). Median change in HORMS wavefront error was 0.013 μm (maximum, 0.019 μm). All lenses exhibited HORMS changes less than one-eighth equivalent diopters (P = .002). Median percentage change in HORMS wavefront error in the three wavefront-guided lenses was 0.96% (maximum, 1.25%). Median change in base curve radii was 0.00 mm, with all lenses exhibiting changes (P = .002), less than the American National Standards Institute tolerance of 0.05 mm. CONCLUSIONS: Cleaning over an equivalent 12-month period did not induce clinically significant changes in the optical or base curve properties of conventional or wavefront-guided scleral lenses. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire The Impact of Misaligned Wavefront-guided Correction in a Scleral Lens for the Highly Aberrated Eye / Sujata Rijal in OVS : Optometry & Vision Science, vol. 97, 09 (Septembre 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 09 (Septembre 2020)
Titre : The Impact of Misaligned Wavefront-guided Correction in a Scleral Lens for the Highly Aberrated Eye Type de document : article de périodique Auteurs : Sujata Rijal ; Lan Chi Nguyen ; Matthew J. Kauffman ; Raymond A Applegate ; Jason Marsack Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Vision oculaire
[Thésaurus HELB]:Optique:lentilles sclérales
[Thésaurus HELB]:Optique:port de lentilles de contact
[Thésaurus HELB]:Paramédical:correction de la déficience visuelleRésumé : SIGNIFICANCE: To achieve maximum visual benefit, wavefront-guided scleral lens corrections (WGCs) are aligned with the underlying wavefront error of each individual eye. This requirement adds complexity to the fitting process. With a view toward simplification in lens fitting, this study quantified the consequences of placing WGCs at two pre-defined locations. PURPOSE: This study aimed to quantify performance reduction accompanying the placement of the WGC at two locations: (1) the average decentered location (ADL; average decentration observed across individuals wearing scleral lenses) and (2) the geometric center (GC) of the lens. METHODS: Deidentified residual aberration and lens translation data from 36 conventional scleral lens–wearing eyes with corneal ectasia were used to simulate WGC correction in silico. The WGCs were decentered from the eye-specific pupil position to both the ADL and GC locations. The impact of these misalignments was assessed in terms of change (from the aligned, eye-specific pupil position) in higher-order root mean square (HORMS) wavefront error, change in log of the visual Strehl ratio (logVSX), and predicted change in logMAR visual acuity (VA). RESULTS: As expected, HORMS increased, logVSX decreased, and predicted VA was poorer at both ADL and GC compared with the aligned condition (P < .001). Thirty-four of 36 eyes had greater residual HORMS, and 33 of 36 eyes had worse logVSX values at the GC than at the ADL. In clinical terms, 19 of 36 eyes at the ADL and 35 of 36 eyes at the GC had a predicted loss in VA of three letters or greater. CONCLUSIONS: The placement of the WGC at either ADL or GC is predicted to lead to a noticeable reduction in VA for more than half of the eyes studied, suggesting the simplification of the fitting process is not worth the cost in performance Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
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