Straylight values 1 month after laser in situ keratomileusis and photorefractive keratectomy

Beerthuizen, Jeroen J.G.; Franssen, Luuk; Landesz, Monika; Berg, Thomas

doi:10.1016/j.jcrs.2007.01.017

Cited by 36 publications

(32 citation statements)

References 16 publications

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“…Moreover, the level of myopic correction in previous studies was also higher (21,29) , which is likely to trigger a more exuberant wound healing response, possibly associated with generation of myofibroblasts and greater production of disorganized extracellular matrix as well as activated keratocytes (corneal fibroblasts), thus increasing ocular straylight. There are several reports (13,30) of haze as a cause of increased straylight, and we agree that the development of moderate-to-severe haze is an important factor (24) . In the present study, the overall low myopic correction, with and without MMC application, likely led to the faster recovery of corneal transparency.…”

Section: Discussionsupporting

confidence: 79%

Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C

Torricelli¹,

Parede²,

Netto³

et al. 2016

Arquivos Brasileiros De Oftalmologia

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Purpose: To evaluate ocular straylight before and after photorefractive keratectomy (PRK) for low myopia with and without topical mitomycin (MMC) treatment. Methods: Patients who underwent PRK for low myopia were enrolled into the study. PRK without MMC was performed in 21 eyes (12 patients), whereas PRK with topical 0.02% MMC was performed in 25 eyes (14 patients). Both groups were treated using the NIDEK EC5000 excimer laser. Measurements were performed using the C-Quant straylight meter preoperatively and at two and four months postoperatively. Results: The mean patient age was 30 ± 4 years, and the mean spherical equivalent refractive error was -2.2 ± 0.75 D. The mean preoperative intraocular straylight values were 1.07 ± 0.10 in the PRK without MMC group and 1.07 ± 0.11 log(s) in the PRK with topical MMC group. At two months after surgery, there was a decrease in mean intraocular straylight values in both groups. However, a significant difference was only reached in the PRK with MMC group [0.98 ± 0.09 log(s), p=0.002] compared with preoperative values, which was likely due to a greater scatter of measurements in the PRK without MMC group [1.03 ± 0.13 log(s), p=0.082]. At four months postoperatively, ocular straylight values were not significantly different compared with those at baseline in either the PRK without MMC group [1.02 ± 0.14 log(s), p=0.26] or in the PRK with topical MMC group [1.02 ± 0.11 log(s), p=0.13]. Conclusion: PRK for low myopia decreases ocular straylight, and MMC application further reduces straylight in the early postoperative period. However, ocular straylight values do not significantly differ at four months after surgery compared with those at baseline. (1,02 ± 0,14 log(s), p=0,26) quanto no grupo com MMC tópica (1,02 ± 0,11 log(s), p=0,13). Keywords meses da cirurgia houve uma diminuição na média da dispersão de luz intraocular em ambos os grupos. Entretanto uma diferença estatisticamente significante, comparado com os valores préoperatórios, foi observada apenas no grupo PRK com MMC (0,98 ± 0,09 log(s), p=0,002), provavelmente devido as medidas com maior espalhamento de luz no grupo sem MMC (1,03 ± 0,13 log(s), p=0,082). Após 4 meses de pósoperatório, os valores de dispersão de luz não apresentavam diferença estatisticamente significantes quando comparados com os valores iniciais, tanto no grupo sem MMC Conclusão: PRK para baixa miopia diminui a dispersão de luz ocular e a aplicação de MMC contribui para uma ainda menor dispersão de luz no período pósoperatório inicial. Entretanto, quatro meses após a cirurgia a dispersão de luz intraocular não é significantemente diferente das medidas préoperatórias.Descritores: Ceratectomia fotorrefrativa; Miopia/cirurgia; Mitomicina; Cicatrização this as a troubling symptom, at least in the early postoperative period, following procedures such as photorefractive keratectomy (PRK).Disability glare is the veiling of vision due to the forward scattering of light in the eye (5,6) . Straylight is a known source of disability glare (7) . Th...

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Section: Discussionsupporting

confidence: 79%

Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C

Torricelli¹,

Parede²,

Netto³

et al. 2016

Arquivos Brasileiros De Oftalmologia

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“…31 However, due to the improvement of the surgical techniques, more recent reports seem to indicate a lower incidence of increased straylight levels in refractive surgery. 32,33 In the present paper, methodological aspects of straylight/glare assessment for the aging population are discussed. First, the performance of assessment technology will be presented, based on a multicenter study comparing 3 subject groups: young, aged, and cataractous.…”

Section: Introductionmentioning

confidence: 99%

Disability Glare in the Aging Eye. Assessment and Impact on Driving☆

Berg

Rijn

Kaper-Bongers

et al. 2009

Journal of Optometry

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PURPOSE:To compare different methods for the assessment of disability glare sensitivity in the elderly, to arrive at an objective assessment of the condition of the eye. To delineate the importance of straylight values in vision. METHODS: Three groups of subjects were studied: 1) Young subjects without any eye disease, 2) elderly subjects without any eye disease and 3) elderly subjects with (early) cataract in at least one eye. All subjects underwent 2 glare tests, 2 straylight tests, ETDRS visual acuity test, Pelli Robson contrast sensitivity test, refraction, LOCS III cataract classification. Straylight was quantified by means of the straylight parameter s. RESULTS: Repeatability, discriminative ability, and added value as compared to visual acuity were low for the glare tests and good for the straylight measurements. For young normal subjects, with log(s)=0.9, the standard glare situation with low beams gives a contrast reduction of 1.3, whereas for the healthy 77 year olds this increases to 2. With cataract hardly affecting visual acuity, log(s) can be as high as 1.8, resulting in a contrast reduction of 3.4. CONCLUSION: Straylight measurement is of relevance for the assessment of the glare-related hindrance during driving, and can be used to objectify complaints and aid in the decision-making regarding cataract surgery. (J Optom 2009;2:112-118 ©2009 Spanish Council of Optometry) KEY WORDS: straylight; glare sensitivity; disability glare; CIE; aging; driving. RESUMEN OBJETIVO:Comparar diferentes métodos para medir la sensibilidad al deslumbramiento perturbador en sujetos de edades avanzadas, con el fin además de lograr una valoración objetiva de las afecciones oculares. Definir la importancia que tiene la luz dispersa (parásita) sobre la visión. MÉTODOS: Se estudiaron tres grupos de sujetos: 1) Sujetos jóvenes sin ningún tipo de afección ocular, 2) sujetos de edad avanzada sin ningún tipo de afección ocular y 3) sujetos de edad avanzada con cataratas (incipientes) en, al menos, uno de los ojos. A todos los sujetos se les realizaron, entre otras, 2 pruebas de deslumbramiento y 2 pruebas de luz dispersa, se les midió la agudeza visual mediante optotipos ETDRS (siglas en inglés del Estudio sobre el tratamiento temprano de la retinopatía diabética), la sensibilidad al contraste con el test de Pelli-Robson, la refracción, y se clasificó la catarata (para sujetos del tercer grupo) utilizando el Sistema de Clasificación de Opacidades del Cristalino( o sus siglas en inglés, LOCS III). La luz dispersa (parásita) se cuantificó por medio del parámetro de luz dispersa s. RESULTADOS: La repetibilidad, la capacidad discriminativa, y el valor añadido, resultaron ser bajos para los tests de deslumbramiento pero buenos para las medidas de la luz dispersa (en comparación con los valores que proporciona la medida de la agudeza visual). Para los sujetos jóvenes sin patologías oculares, con log(s)=0,9, la situación habitual de deslumbramiento con haces bajos causa una reducción del contraste del 1,3, mientras que para l...

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“…It found that 33 out of 373 subjects who had had laser refractive surgery scored above this limit. Studies in refractive surgery centres showed somewhat better results (Beerthuizen, Franssen, L., & van den Berg, 2007;Lapid-Gortzak, van der Linden, van der Meulen, Nieuwendaal, & van den Berg, 2010;Rozema et al, 2010;Vignal, Tanzer, Brunstetter, & Schallhorn, 2008). Advancing techniques will, in time, yield more reliable results.…”

Section: Discussionmentioning

confidence: 97%

Measurement of straylight for glare assessment and driving.

Berg

2017

Scand J Optom Vis Sci

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This review presents an overview of straylight as a quantification for glare sensitivity, to be used as a criterion for driver licensing. Glare disturbance is an important safety issue while driving. It is a known fact that glare issues in the early stages of cataract development are one reason why people give up driving at night. Glare is caused by the physical process of light scattering in the eye, causing a veil of straylight seen over the road. This veil lessens visibility, potentially to the point of complete blindness. By international agreement, glare must be quantified by measuring straylight, based on the "equivalent luminance" concept. Normal standards have been defined, including the dependence of straylight on age and cataract. Straylight can be measured accurately with the psychophysical 2AFC "compensation comparison" method, including a reliability check. An instrument for straylight measurement, the C-Quant is now commercially available. Straylight is a basic aspect of the eye, on which also other aspects of quality of vision, such as face recognition, contrast sensitivity, etc. depend. Straylight presence is used in ophthalmology as an early indication for cataract surgery. It is to a large degree independent of acuity. This review discusses the practical aspects of straylight measurement and limit values for occupational testing. Normal values for young subjects are around log(s) = 0.9. For demanding professions, a limit elevation of 2× (0.3 log, corresponding to 3 standard deviations) is proposed. For normal driving a limit elevation of 4× is proposed, corresponding to log(s) = 1.5. Cataract surgery is indicated at log(s) = 1.4. SammendragDenna artikel ger en översikt av bländning och kvantifiering av bländningkänslighet, som kan användas som kriterium för körkortstillstånd. Bländning är en viktig säkerhetsfråga vid bilkörning. Det är ett känt faktum att bländningsproblem i de tidiga stadierna av kataraktutveckling är en orsak till att män-niskor ger upp körning på natten. Bländning orsakas av den fysiska processen ljusspridning i ögat, vilket ger en slöja som ses över vägen. Enligt internationell överenskommelse måste bländning kvantifieras genom mätning av ljusspridningen, baserat på begreppet "ekvivalent luminans". Normala normer har definierats, inklusive beroende av straylight på ålder och katarakt. Ljusspridning kan mätas exakt med den psykofysiska 2AFC "kompensationsjämförelse metod", inklusive en pålitlighetskontroll. Ett instrument för ljusspridningsmätning är C-Quant, finns nu kommersiellt tillgängligt. Ljusspridning är ett grundläggande begrepp, där också andra aspekter av synkvalitet, såsom ansiktsigenkänning, kontrastkänslighet etc. ingår. Ljusspridning används i oftalmologi som en tidig indikation för kataraktoperation. Det är i stor utsträckning oberoende av visus. Denna översyn diskuterar de praktiska aspekterna för mätning ljuspridning och gränsvärden. Normala unga värden är runt log(s) = 0,9. För krävande yrken föreslås ett gränsvärde på 2× (0, 3 log, motsvarande 3 st...

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Straylight values 1 month after laser in situ keratomileusis and photorefractive keratectomy

Abstract: Straylight values 1 month after LASIK or PRK did not increase on average, although individual straylight values increased in some cases.

Cited by 36 publications

References 16 publications

Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C

Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C

Disability Glare in the Aging Eye. Assessment and Impact on Driving☆

Measurement of straylight for glare assessment and driving.

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