Effect of Full-Face and Half-Face Helmet on Functional Vision and Visual Reaction Time.

Background: Motorcycle helmets are one of the most important protective gears in the automotive industry. However, some riders think they hinder their vision, which leads to helmet non-compliance. Hence, thorough research is required to evaluate the same. Aim and Objective: To assess the effect of full-face and half-face helmets on functional vision and visual reaction time (VRT). Setting and Study Design: Comparative experimental crossover study. Methods: The subjects aged between 18 and 35 years and who gave written consent to participate were included. Functional vision and VRT were assessed with and without the helmets. Helmets tested included a full-face helmet and a half-face helmet. Results: A total of 52 subjects aged 20 ± 1.5 years, participated in the study. Of those, 16 were males and 36 were females. The mean stereopsis without any helmet was 44.42 ± 6.3 arcs of second that reduced to 60.57 ± 13.34 arcs of second with a full-face helmet and to 60.38 ± 14.27 arcs of second with a half-face helmet. Repeated-measure analysis of variance showed a significant reduction in stereopsis in both types of helmets (P < 0.05) as compared to without a helmet. However, contrast sensitivity, VRT, and visual field did not show any significant difference (p > 0.05) when compared to the baseline or within the helmet types. Conclusion: The visor significantly affects the stereopsis while viewing through it. The study did not find the exact cause of this reduction, and hence, further evaluation is recommended.

Concerns regarding Indian prosthetic eye wearers.

CLINICAL RELEVANCE: Loss of an eye has a negative impact on the psychological health of a person. BACKGROUND: The aims are to: (a) identify the concerns of experienced prosthetic eye wearers in representative areas of India; (b) investigate how they change over time; (c) study how some demographic characteristics influence concerns; and (d) compare prosthetic eye concerns in India versus Germany and New Zealand. METHODS: This observational multi-centre study was conducted in the cities of Mumbai, Bengaluru and Delhi. Subjects aged from 18 to 65-years, with experience of at least two years of wearing a prosthetic eye fabricated from polymethyl methacrylate material, completed a validated questionnaire over the telephone. The questionnaire captured demographic data and general and prosthetic eye concerns at the time of eye loss and at the present time. RESULTS: At the time of eye loss, the five main concerns of participants were: health of the remaining eye; change in appearance; comfort; colour of the prosthesis; and movement of the prosthesis. However, after at least two years these concerns were significantly reduced (p < 0.05). The main present-day concern was watering, crusting and discharge, which was experienced by 81.1-per cent of the participants, 55.5-per cent of them on a daily basis. Compared with other demographic groups, blue-collar workers had higher odds of being concerned about the health of the remaining eye and least odds about prosthesis motility. Homemakers had higher odds of being concerned about wearing comfort and students had higher odds of being concerned about wearing comfort, appearance and health of the remaining eye. CONCLUSION: Initial concerns significantly reduce after two years. Watering, crusting and discharge are the most important current concerns for anophthalmic participants.

A novel strategy for management of uncorrected refractive errors in urban slums.

BACKGROUND: Blindness and Vision impairment remains a major public health issue not only in rural but also in urban areas. Concept of using peripheral health centers to render primary health care services to the community was a WHO proposed model. However, establishing them in urban slums is a challenge as most of the slums are illegal establishments. So, aim was to establish vision centers for providing primary eye care services in the urban slums of Mumbai, West India. METHODS: Vision centers were established in various slum pockets of Mumbai from the year 2008 till 2009. Refraction and screening for ocular morbidity were carried out for those who attended this center and management for uncorrected refractive errors was done. RESULTS: Data from 6 such vision centers located in various slum pockets of Mumbai city from April 9 to March 2011 were collected and analyzed. Of the 19,550 adults, 2270 (11.61%) had moderate vision impairment with presenting visual acuity of <0.5 LogMAR in both eyes. Severe Visual impairment was seen in (723) 3.70%. Blindness was seen in (357) 1.82%. Of the 2993, which were moderately and severely visually impaired, 1893 subjects that is, 63.24% of them improved to 0.2 LogMAR or better with spectacle correction. CONCLUSIONS: About 63.24% of visual impairment was due to uncorrected refractive errors, these included both moderately and severely vision impaired. Totally, 357 (1.82%) were also identified as blind. This model of vision centers has a role in the identification and management of sight-threatening problems.

Effectiveness of measuring the central field with the Berkeley field test.

INTRODUCTION: There are several limitations of the Amsler chart as a screening tool due to its low sensitivity and high false-negative results. The Berkeley central visual field test (BCFT), which is a simple power-point presentation of a 50-point scoring system for the central 10-degree of the visual field, was devised as an alternative to the Amsler chart. OBJECTIVES: To compare the efficacy of measuring the central visual field using the Berkeley central field test (BCFT) and the Amsler grid test. MATERIALS AND METHODS: In a comparative and validity study, 30 subjects with maculopathy and 35 controls were recruited. The maculopathy subjects with the best corrected visual acuity of 20/200 or better and 2.5M for distant and near vision respectively, were included. All the subjects under went a complete eye examination where visual assessment was done using the distant and near vision Log MAR Chart. The subjects were assessed with the Amsler chart-II at a distance of 30 cm. The BCFT was used as a 50- point scoring system. The effectiveness of BCFT was compared with that of the Amsler grid regarding the sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV). RESULTS: Out of 65 subjects, 30 subjects had maculopathy and 35 were normal. The mean age of the 65 subjects was 49.8±9.1 years. Of the 30 subjects with maculopathy, the majority (54%) had age- related macular degeneration. The sensitivity, specificity, PPV and NPV of the Amsler grid test were found to be 80%, 100%, 100% and 87%, respectively, whereas those of the BCFT were 71%, 99%, 98% and 82% (p=0.37). CONCLUSION: The BCFT test was as good as the Amsler grid test at detecting the presence of maculopathy.