By Dhivya Gnana Sekar, student of the Master in Clinical Optometry and Vision Therapy


Purpose: The aims of this study were to analyze the correlation between the performance on fine motor skills tasks and sensory fusion, the level of visual acuity (VA) in the poorer seeing Eye, and the inter ocular visual acuity difference.

Methods: Subjects aged 12 to 28 years with a range of levels of binocular vision and visual acuity performed three tasks: Fishing game (time taken to pick fixed number of fishes), bead threading task (with two sizes of bead to increase the difficulty, time taken to thread a fixed number of beads), and a water pouring task (accuracy and time to pour a fixed quantity into five glass cylinders). Ophthalmic measures included Worth 4 dot, stereopsis (sensory fusion), amount of strabismus, and monocular visual acuity.

Results: Forty-five subjects with a mean age of 18.35 years (range: 12 to 27 years); 64.44 % (n=29) were female. Two subjects (4.44%) had a manifest strabismus. Of the remaining 43, 19 were orthophoric, 14 had an exophoria (up to 12), and 10 had an esophoria. There were no vertical phorias detected. Performance on fine motor skills tasks was significantly better in subjects with sensory and motor fusion compared with those without for most tasks.

Conclusions: Both sensory and motor fusion and good visual acuity in both eyes are of benefit in the performance of fine motor skills tasks, with the presence of some binocular vision being beneficial compared with no fusion on certain sensorimotor tasks. This evidence supports the need to maximize fusion and visual acuity outcomes.

Keywords: Suppression, stereoacuity, visual acuity, binocular vision, motor skill tasks.

Download the full Research Work: Dhivya Gnana Sekar (2018). Correlation between Binocular Vision and Functional Performance. SAERA


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