Degradation of Visual Performance With Increasing Levels of Retinal Stray Light

Abstract

PURPOSE.To quantify the effect of induced stray light on halo size, luminance threshold, and contrast sensitivity. METHODS.Retinal stray light was induced in five healthy subjects using different photographic filters. The stray light induced ranged from levels observed in intraocular lenses (IOLs) with glistenings (low) to cataract level (high). The visual impact was measured for halo size, luminance detection threshold, and contrast sensitivity with and without a glare source.RESULTS. The amount of retinal stray light induced by the different filters was similar when measured using the psychophysical method and the optical bench method. Low amounts of induced stray light cause the halo size to increase by 21%, the luminance detection threshold to increase by 156%, and contrast sensitivity to decrease by 10% to 21% dependent on spatial frequency and presence of a glare source. The visual impact percentages for high amounts of induced stray light were, respectively, 76%, 2130%, and 30% to 49%. In the presence of a glare source, contrast sensitivity losses were larger and shifted to lower spatial frequencies.CONCLUSIONS. Low levels of retinal stray light can cause significant increases in halo sizes, elevations in luminance detection thresholds, and reductions in contrast sensitivity whether or not a glare source is present.

Use of Functional Balance Measurement Tools to Predict the Fear of Falling in Faller and Non-Faller Chronic Stroke Patients

“…The result of the test according to Table 1 and 3 for optotypes with luminance of and 5 cd/m2 was significant (P<0.001) better than 1 cd/m2. The acuity preserve in glare situation increased in more luminance (5cd/m 2 ), consistent with other studies (Theeuwes, 2002;Van der Mooren, 2016). It showed that more contrast needed for preserving the visual acuity in a glare source condition.…”

Visual Function and Functional Decline in Patients With Waterclefts

“…Furthermore, this study is the first to clarify that LP is significantly decreased in eyes with WC-3-type opacity and that this could be a factor for hyperopia. Increased straylight [9][10][11] was reported as a factor for decreased quality of vision (QOV) in eyes with cataracts. In this study, straylight was significantly increased in eyes with WC-2-and -3-type cataracts.…”

“…Qu et al 3 reported that eyes with WCs have significantly higher rates of higher-order aberrations (HOAs) than transparent eyes and that decreased corrected and contrast visual acuity (CVA) are frequently observed in the former. Apart from increased HOA, [4][5][6][7] increased backward light scattering (BLS) 4,8 was reported as factors decreasing visual acuity with lens alterations, and increased straylight [9][10][11] decreases visual function; however, there are no detailed studies on change in straylight or factors affecting decreased visual function in eyes with WCs to date. Furthermore, there are various types of WC morphology, including those with opacity only within the pupil center region, in its periphery, or in both, but the details on the underlying mechanism through which these morphologic differences may change visual function remain unclear.…”

Through-Focus Optical Bench Performance of Extended Depth-of-Focus and Bifocal Intraocular Lenses Compared to a Monofocal Lens

“…The halo may be a major contributor to the image quality degradation that has been found in the MTF analysis. Van der Mooren et al 13 reported the effect of stray retinal light on the degradation of visual performance by showing a positive correlation with halo size, luminance threshold, and contrast sensitivity.…”