Static accommodative responses following adaptation to differential levels of blur

Cufflin, Matthew P; Hazel, Charlotte A.; Mallen, Edward A. H.

doi:10.1111/j.1475-1313.2007.00491.x

Cited by 19 publications

(24 citation statements)

References 32 publications

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“…Rosenfield et al 11 measured on 22 slightly myopic subjects an increase of visual acuity of 0.23 logMAR after 3 hours without compensation. Cufflin et al 12 found after blur adaptation of 45 minutes, on 11 emmetropes and 11 early-onset myopes, an improvement in visual acuity of 0.17 logMAR and 0.23 logMAR following adaptation to +1 D and +3 D of defocus respectively. They also noted that acuity changes became significant after 30 minutes of exposure to optical defocus.…”

Section: Introductionmentioning

confidence: 99%

Calculations and Measurements of the Visual Benefit of Correcting the Higher-order Aberrations Using Adaptive Optics Technology

Legras

Rouger

2008

Journal of Optometry

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PURPOSE: Our goal was to examine the accuracy of metrics, calculated using a numerical eye model including the measurement of the monochromatic aberrations of the eye, to predict the contrast sensitivity (CS) and visual acuity (VA) visual benefits (VB) of correcting higher-order aberrations (HO). METHODS: We measured, on the right eyes of 25 subjects (10 myopes and 15 emmetropes) aged 21 to 56 years, the 16 c/deg CS and high-contrast VA in two conditions of aberration corrections: (i) when correcting only the defocus and astigmatism terms and (ii) when dynamically correcting all the monochromatic aberration terms up to the 5 th order. The measured VB was defined as the ratio of the performances between these two conditions of aberration corrections. RESULTS:We measured a VB of 1.25 and 1.64 respectively in term of VA and CS. We did not find any influence of age on the VB and no statistical significant difference between the myopic and emmetropic group. The contrast sensitivity VB was well correlated (r 2 =0.79) with the ratio of the modulation transfer functions calculated at 16 c/deg in both conditions of aberrations corrections (i.e. MTF16c/deg HO /MTF16c/deg SC ). The levels of correlation between various metrics and measured visual acuity VB were lower (r 2 =0.30 in the better case), however the averaged VB was correctly predicted by the ratio of the intersections between the MTF and a typically neural contrast threshold function. CONCLUSIONS: Metrics based on wave aberration measurements are able to predict the impact of monochromatic aberrations on CS.(J Optom 2008;1:22-29 ©2008 Spanish Council of Optometry) KEY WORDS: image quality; adaptive optics; visual benefit; visual performance; monochromatic aberrations. RESUMEN OBJETIVO:Nuestro objetivo era analizar la validez y la precisión de los descriptores numéricos objetivos (calculados a partir de un modelo de ojo existente al que incorporamos las aberraciones monocromáticas del ojo de cada sujeto) a la hora de predecir los beneficios visuales (BV) sobre la sensibilidad al contraste (SC) o sobre la agudeza visual (AV) obtenidos tras corregir las aberraciones de alto orden. MÉTODOS: Medimos la SC a 16 c/grado y la AV de alto contraste en el ojo derecho de 25 sujetos (10 miopes y 15 emétropes) de edades comprendidas entre los 21 y los 56 años. Las medidas se realizaron en dos condiciones distintas de corrección de aberraciones: (i) cuando sólo los términos de desenfoque y de astigmatismo estaban corregidos y (ii) cuando todas las aberraciones monocromáticas hasta 5º orden fueron corregidas dinámicamente.La medida de los BV se definió como la razón de los resultados obtenidos en cada una de estas dos condiciones de corrección de aberraciones. RESULTADOS: Los BV sobre la AV y la SC fueron, respectivamente, de 1,25 y de 1,64. No encontramos ninguna dependencia de los BV con la edad del sujeto, ni ninguna diferencia estadísticamente significativa entre el grupo miope y el emétrope. Se obtuvo una notable correlación (r 2 =0,79) entre los BV sobre la sensi...

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Section: Introductionmentioning

confidence: 99%

Calculations and Measurements of the Visual Benefit of Correcting the Higher-order Aberrations Using Adaptive Optics Technology

Legras

Rouger

2008

Journal of Optometry

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“…10,11 In contrast, Vera-Diaz et al 12 did observe that the addition of Gaussian blur caused an increase in the accommodation response magnitude in a group of myopes, but not EMMs. This increase was sustained following removal of the blur for stimulus demands of 3.00 D and 0.25 D. However, no pre-and post-blur adaptation comparisons were made for the dynamic accommodation characteristics (i.e., accommodative latency or response time).…”

Section: Adaptation To Defocusmentioning

confidence: 90%

Dynamic Accommodation Responses Following Adaptation to Defocus

Cufflin

Mallen²

2008

Optometry and Vision Science

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“…This difference in terms of VA between KC and "normal" eyes could be explained by the presence, in KC eyes, of a compensation mechanism that makes up for the poor retinal image quality by improving the post-receptor treatment. Some authors [2][3][4][5] had previously measured a significant improvement of VA after exposure to optical blur induced by defocus for several minutes (ranging from 30 to 180 min), which suggests the possible existence, for VA-related tasks, of neural adaptation to a blurred retinal image. However, for "normal" eyes we obtained a slightly higher CS (with an average difference of 0.05 log units) than for KC eyes, meaning that no adaptation occurred in terms of CS.…”

Section: Figurementioning

confidence: 99%

“…Mon-Williams et al 2 measured a VA increase of 0.10 logMAR, averaged across 15 subjects, after a 30-min period of +1.00 D induced defocus blur. After 45 min of viewing through +1.00 D and +3.00 D lenses, Cufflin et al 3 found an improvement in VA of 0.17 logMAR and 0.23 logMAR respectively. They also noted that VA changes became significant after 30 minutes of exposure to optical blur.…”

Section: Introductionmentioning

confidence: 99%

Visual Tasks Dependence of the Neural Compensation for the Keratoconic Eye's Optical Aberrations

Rouger

Bénard

Gatinel

et al. 2010

Journal of Optometry

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PURPOSE: To investigate whether "normal" eyes viewing through keratoconic (KC) eye aberrations can achieve a similar visual performance (VP) to that of KC eyes. METHOD: We measured the high-contrast visual acuity (VA) and the 10, 15 and 20 c/deg contrast sensitivity (CS) of 6 KC eyes and 6 "normal" eyes while dynamically correcting their monochromatic aberrations. The VP of both populations was also measured when viewing through the usual sphero-cylindrical correction (i.e. spectacle correction) of each KC eye. In both cases, the desired wavefront was simulated thanks to a deformable mirror. RESULTS: During dynamic correction, both KC and "normal" eyes showed similar (P>0.10) amounts of higher-order aberrations (in average, 0.10 μm of RMS for a 5.5 mm pupil). The difference between KC and "normal" eyes' VP was 0.24 log units and 0.12 log-MAR in terms of CS and VA, respectively. When viewing through KC eye aberrations, "normal" eyes showed comparable or slightly better CS (difference of 0.05 log units) but lower VA (difference of 0.13 logMAR) than KC eyes. CONCLUSIONS: KC subjects are adapted to their poor retinal image quality. However, this neural adaptation might only occur for usual "real life" visual tasks (i.e., VA-related tasks). (J Optom 2010;3:60-65 ©2010 Spanish Council of Optometry) KEY WORDS: blur adaptation; aberrations; keratoconus; contrast sensitivity; visual acuity; adaptive optics. RESUMEN OBJETIVO:Investigar si un ojo "normal" que ve a través del patrón de aberraciones de un ojo con queratocono (QC) puede lograr una calidad visual (CV) similar a la que tiene un ojo con QC. MÉTODOS: Hemos medido la agudeza visual (AV) de alto contraste y la sensibilidad al contraste (SC) a 10, 15 y 20 ciclos/grado en 6 ojos con QC y en 6 ojos "normales", a la vez que corregíamos de manera dinámica sus aberraciones monocromáticas. También se midió la CV de ambos grupos, pero esta vez anteponiendo la corrección esferocilíndrica habitual (es decir, la corrección de sus gafas) de cada uno de los ojos con QC participantes en el estudio. En ambos casos, el frente de onda deseado se generó por medio de un espejo deformable. RESULTADOS: Durante la corrección dinámica, tanto los ojos con QC como los "normales" presentaron una cantidad similar (P>0,10) de aberraciones de alto orden (RMS promedio: 0,10 μm para un diámetro de pupila de 5,5 mm). La diferencia de CV entre ojos con QC y ojos "normales" resultó ser igual a 0,24 unidades log. (SC) y a 0,12 logMAR (AV). Cuando se hizo ver a ojos "normales" a través del patrón de aberraciones de ojos con QC, se observó que los ojos "normales" tienen una SC comparable o ligeramente mejor que los ojos con QC (diferencia de 0,05 unidades log.) pero una AV más baja (diferencia de 0,13 logMAR). CONCLUSIONES: Los sujetos con QC están adaptados a la mala calidad de su imagen retiniana. Sin embargo, esta adaptación neuronal podría producirse únicamente en el contexto de tareas visuales habituales de la "vida diaria" (es decir, aquellas presentes en un test de AV). (J Optom 2010;3...

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Static accommodative responses following adaptation to differential levels of blur

Cited by 19 publications

References 32 publications

Calculations and Measurements of the Visual Benefit of Correcting the Higher-order Aberrations Using Adaptive Optics Technology

Calculations and Measurements of the Visual Benefit of Correcting the Higher-order Aberrations Using Adaptive Optics Technology

Dynamic Accommodation Responses Following Adaptation to Defocus

Visual Tasks Dependence of the Neural Compensation for the Keratoconic Eye's Optical Aberrations

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