Fusional Vergence amplitude measurement among students of ISRA School of optometry, Isra University, Karachi campus
- Advances in Ophthalmology & Visual System
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Shua Azam, Areej Qadir, Almas
Abstract
Purpose: To determine mean fusional vergence amplitudes FVA and the effect age and
gender on FVA.
Methodology: A cross sectional descriptive study was conducted among Isra School
of optometry, Isra University, Karachi campus students from August 2023 to December
2023. A total of 120 students consisting of 43 males (35.8%) and 77 females (64.1%) were
recruited using a convenient sampling technique. Inclusion criteria included subjects with
6/6 vision, no any ocular disease, strabismus and subjects with exophoria or esophoria. The
age ranged from 18-27 years. Patients underwent ophthalmic procedure i.e. visual acuity
for both distance and near and ophthalmoscopy was performed to check the clarity of the
patient’s media. After assessing the ocular media, cover test was used to check the type
of phoria. By using horizontal prism bars, Positive Fusion Vergence (PFV) and Negative
Fusion Vergence (NFV) were recorded as break, and recovery points at near and distance.
All the information was recorded in self-made Performa. Data was analyzed using SPSS.
Result: Students were categorized into three age groups: Group 1 (18-21 years), Group 2
(22-24 years), and Group 3 (25-27 years). The data showed negative fusional divergence
break-up and recovery points at distance and near, with mean values of 10.06±4.8 Δ and
7.3±4.7 Δ, respectively. Positive fusional convergence break-up and recovery points at
distance and near had mean values of 10.95±6.11 Δ and 8.1±5.57 Δ, respectively. The result
for negative divergence break and recovery point at distance were significant with p-value
of 0.021 and 0.026, respectively
Conclusion: This study concluded that the mean fusional vergence amplitudes FVA at
near and distance are reduced while distance and near FV revealed no effects of age and
gender. However, negative fusional break point and positive fusional recovery point were
significantly affected by age.
Keywords
fusional Vergence amplitudes, binocular single vision, Isra school of optometry
