Journal of Clinical and Experimental Ophthalmology
Open Access
ISSN: 2155-9570
ISSN: 2155-9570
Chiranjib Majumder and Lavennia Sinathamby
RJN School of Optometry, India
Twintech International University College of Technology, Malaysia
Posters & Accepted Abstracts: J Clin Exp Ophthalmol
Statement of the Problem: Th e VDU related eye fatigue is showing an increasing pattern in all over the world. Out of many factors contributed to VDU related eye fatigue, illumination is one the major factor. Researchers have shown that, values of accommodation focused beyond the convergence at brighter illumination but both are same in darker illumination. Several ergonomic studies have shown, viewing distance and angle are not only the factor that can infl uence the convergence level among VDU user but also the illumination. Purpose of the Study: To fi nd out the changes in the positive fusional vergence at near, under diff erent room illuminations while using VDU as a target. Methodology & Th eoretical Orientation: A cross-sectional study was performed by using convenience sampling method. Subjects with a best corrected visual acuity of 6/6 and N6 were included in the study. Subjects having any ocular pathology, presbyopia, eye movement disorder, binocular vision anomaly, systemic illness and contact lens wearers were excluded. Amount of positive fusional vergence at near were measured by using a base out prism under three diff erent room illuminations (7 Lux, 19 Lux, 33 Lux). Blur, break and recovery were recorded and data were analyzed by using a repeated measure Friedman Test to investigate the changes in positive fusional vergence at near under diff erent room illuminations. Findings: Positive fusional vergence for near has changed signifi cantly in three diff erent levels of room illumination (p=0.012, p=0.003 and p=0.006 for blur, break and recovery respectively). However, positive fusional vergence between gender was not signifi cant (p>0.05). Conclusion & Signifi cance: A signifi cant diff erence in positive fusional vergence has been observed for near under diff erent level of room illuminations.