Glare and halo with refractive correction

Abstract

Background:The aim of this investigation was to compare glare and halo with various methods of refractive correction. Methods: Ninety-eight eyes of healthy pre-presbyopes were analysed for the presence of glare and halo using computer-generated stimuli. Subjects were divided into three groups: emmetropes without correction, single vision plastic lens spectacle wearers (with clean and dirty lenses) or single-vision soft contact lens wearers. Results: No significant difference in glare was found among groups. Significant differences were noted in halos between emmetropes and both contact lens (p < 0.001) and uncleaned spectacle groups (p < 0.05) but not with cleaned spectacles. The reduction in halo size after cleaning the lenses was significant (p < 0.0187). Conclusions: Contact lens and unclean spectacle wearers both have significantly larger halos than emmetropes and those wearing cleaned spectacle lenses. Unclean spectacles may affect the accuracy of results in psychophysical and clinical testing.

Normal Values for the Size of a Halo Produced by a Glare Source

“…7,10 Alternatively, the subject had to place a marker at the outer limit of the halo using a computer mouse at a 1 m distance. 13 The main shortcoming of these methods is that if the subject does not see a defi ned halo or does not understand what a halo is, identifi cation of the margin of the halo could be diffi cult. Further, each subject might delimit the halo in a different way.…”

“…6 Measuring the size of a glare source-induced halo has been proposed as an objective method of quantifying quality of vision in subjects such as those with night vision problems following refractive surgery, 7,8 with cataract 9 or multifocal intraocular lenses, [10][11][12] and those wearing spectacles or contact lenses. 13 Several methods and testing protocols have been developed to measure halo size. 9,10,13,14 However, methodological limitations such as the subjectivity involved in determining the limit of a diffuse halo on a screen in the absence of a target image with only the glare source makes the fi ndings of such studies diffi cult to interpret.…”

“…13 Several methods and testing protocols have been developed to measure halo size. 9,10,13,14 However, methodological limitations such as the subjectivity involved in determining the limit of a diffuse halo on a screen in the absence of a target image with only the glare source makes the fi ndings of such studies diffi cult to interpret. We propose that a method capable of determining the area of the visual fi eld across which visual L ABSTRACT PURPOSE: To determine the size of a halo in the visual fi eld induced by bright light in healthy eyes of all ages using the Vision Monitor (MonCv3; Metrovision, Pérenchies, France) and to assess the repeatability of the method.…”

Subjective Quality of Vision Before and After Cataract Surgery

“…Spectacles alone may induce visual symptoms secondary to factors such as lens refractive index, base curve, and antireflective coatings. 24,25 A secondary aim of this study was to investigate the correlation between preoperative LOCS III grading of cataract with the 10 visual symptoms of the QoV questionnaire frequency subscale. Overall, results indicated no significant correlations between signs and symptoms except for one comparison: posterior subcapsular cataracts were correlated with the visual symptom of blurred vision (r s = 0.420).…”

Visual Acuity in Myopes with Standard and Reversed Contrast Optotypes

“…However, Allen et al (2008) showed that contact lens wearers observe a larger halo around light sources compared to spectacle wearers. Our main interest was to evaluate the changes in visual acuity for myopes depending on the contrast we used for optotypes (standard or reversed) and to see whether the results were affected by the type of optical correction (contact lenses or spectacles).…”