Mesopic vision in myopia corrected by photorefractive keratectomy, soft contact lenses, and spectacles

Schlote, Torsten; Kriegerowski, Martin; Bende, Thomas; Derse, Matthias; Thiel, Holger; Jean, B.

doi:10.1016/s0886-3350(97)80280-5

Cited by 39 publications

(15 citation statements)

References 21 publications

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“…Moreover, though in the present paper we do not directly measure the response of myopic and hyperopic subjects wearing either contact or ophthalmic lenses, our results are similar to those of Schlote et al [7] and Jewelewicz et al [8] who did not find important differences in night vision for ammetropic subjects wearing either of the two refractive corrections. Thus, our preliminary results suggest that our methodology of inducing ammetropies in emmetropes could be a reliable way of studying, in a controlled manner, the effects of glare on subjects wearing refractive corrections.…”

Section: Discussionsupporting

confidence: 87%

“…Some researchers have evaluated the influence of the different types of corrections under night vision conditions. For example, Schlote et al [7] measured contrast vision and glare sensitivity under mesopic conditions in myopic eyes corrected by soft contact lenses and spectacles and found that their use does not seem to markedly influence mesopic vision in eyes with low to moderate myopia. Moreover Jewelewicz et al [8] evaluated night vision disturbances for myopic subjects finding that there was no significant difference in image degradation between subjects wearing spectacles and soft contact lenses.…”

Section: Introductionmentioning

confidence: 99%

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Methodology to evaluate glare effects in corrected ammetropic subjects

Paul¹,

Colombo²,

Comastri³

et al. 2013

Opt. Pura Apl.

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ABSTRACT:Light originated at a glare source and entering the eye, produces a veiling luminance that causes contrast decrease in retinal images and this effect could differ if the subject wears lenses or not. In this work the glare effects in subjects wearing lenses is studied inducing ammetropies in emmetropes. Contrast thresholds of sinusoidal patterns of 2 cpd and 0.5 cd/m 2 are evaluated without and with glare, the glare source being steady, at 12º and producing 60 lx at the cornea. To exemplify the use of this methodology, 2 emmetropes under 8 different conditions are considered: naked eye; 3 control conditions (wearing neutral lenses) and 4 ammetropic conditions, inducing low (±2 D) and medium (±5 D) myopia and hyperopia with positive and negative contact lenses and correcting them with adequate ophthalmic lenses. The contrast threshold differences between the naked eye and the other 7 conditions are statistically not significant without glare and significant (up to more than 100%) with glare, independently of lens power and probably due to ectopic scattering and multiple reflections. The method proposed enables the determination of the glare effects if lenses are worn though a greater population is required to attain conclusive data.Key words: Night Driving, Ammetropies, Ophthalmic and Contact Lenses, Contrast Threshold. RESUMEN:La luz originada en una fuente deslumbrante que entra al ojo, produce una luminancia de velo que causa una disminución de contraste en las imágenes retinianas y este efecto podría diferir si el sujeto usa lentes o no. En este trabajo se estudian los efectos del deslumbramiento en sujetos que usan lentes induciendo ametropías en emétropes. Se evalúan contrastes umbrales de patrones sinusoidales de 2 cpd y 0.5 cd/m 2 sin y con deslumbramiento, la fuente deslumbrante siendo estable, a 12º y produciendo 60 lx en la córnea. Para ejemplificar el uso de esta metodología, se consideran 2 emétropes en 8 condiciones diferentes: ojo desnudo; 3 condiciones de control (lentes neutras) y 4 condiciones ametrópicas, induciendo miopía e hipermetropía baja (±2 D) y media (±5 D) con lentes de contacto positivas y negativas y corrigiéndolas con adecuadas lentes oftálmicas. Las diferencias de contraste entre el ojo desnudo y las otras 7 condiciones son estadísticamente no significativas sin deslumbramiento y significativas (hasta más de 100%) con deslumbramiento, independientemente de la potencia de la lente y probablemente debido a scattering ectópico y reflexiones múltiples. El

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Methodology to evaluate glare effects in corrected ammetropic subjects

Paul¹,

Colombo²,

Comastri³

et al. 2013

Opt. Pura Apl.

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“…This device is used as a clinical screening test for mesopic vision under conditions of low contrast and glare. Currently it is recommended by the German Ophthalmological Society as a primary night vision screener to test drivers for private and/or commercial vehicle licenses (14,32). The Mesotest II b has great utility as a standardized instrument for night vision research studies because it provides a quantifiable performance measure of night/mesopic visual function both with and without glare.…”

Section: Mesopic Low Contrast Vision Testingmentioning

confidence: 99%

“…Post-PRK QoV issues, especially problems that could degrade I vision at night (25-3 1), must be thoroughly evaluated in terms of potential mission impact. Critically important to night missions are any potential effects on mesopic low contrast visual acuity (VA), both with and without glare (32)(33)(34)(35), and performance with night vision devices, especially Night Vision Goggles. Night Vision Goggle (NVG) visual acuity in aviators has been previously described and well documented (36)(37)(38)(39)(40)(41)(42), but little is known regarding NVG visual acuity performance after PRK.…”

Section: Introductionmentioning

confidence: 99%

Prospective Evaluation of Mesopic Night Vision and Night Vision Goggle Visual Acuity After Photorefractive Keratectomy (PRK)

Miller¹,

Thompson²,

Baldwin³

et al. 2005

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. SUPPLEMENTARY NOTES ABSTRACTThe US Air Force PRK Study involved 98 non-flying, active duty volunteer personnel. All study subjects underwent a comprehensive array of vision tests. Baseline and post-operative data were collected at the Ophthalmology Branch of the Clinical Sciences Division of the USAF School of Aerospace Medicine, in partnership with the Air Force Research Laboratory and Wilford Hall Medical Center. This report covers results from pre-and post-operative night vision goggle (NVG) visual acuity testing. 65 treated subjects and 15 untreated controls completed all post-op visits through 12 months, and 52 treated subjects and 14 untreated controls through 24 months. NVG acuities were collected on a high contrast letter chart (Bailey-Lovie), and custom made grating charts. There was a statistically significant loss of letter acuity at the 4-and 6-month post-op visits for treated subjects but not controls. Acuity returned to baseline levels by 12 months. Mean loss of acuity for groups was typically only a few letters; however, treated subjects were more likely to lose than gain acuity beyond that predicted from repeatability studies with controls.

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“…Diversos estudos evidenciam alteração da qualidade visual com decréscimo da sensibilidade ao contraste no pós-operatório (3)(4) . Em fase do avanço no campo da análise de frente de onda, já está bem estabelecido que as principais causas associadas aos distúrbios de visão noturna estão relacionadas ao aumento das aberrações oculares monocromáticas e ao fenômeno da dispersão da luz através da córnea operada (5)(6) .…”

Section: Resumo Introduçãounclassified