Perception of any single object as a single is achieved by the simultaneous use of both the eyes. This perception is termed as binocular single vision. If bifoveal fixation and normal retinal correspondence is involved, it is a normal binocular single vision but if there is the absence of the bifoveal fixation, which is usually with the abnormal retinal correspondence then it is the abnormal binocular single vison [1].

  Orthophoria is the condition wherein the visual axis of both the eyes directs to the point of fixation and do not show any deviation on being dissociated. In case wherein the visual axis of the two eyes fixates the point but shows deviation on being dissociated, it is termed as heterophoria or Non Strabismic Binocular Vision anomalies (NSBVA) [1]..

References

1. Fiona J Rowe. Clinical Orthoptics, Blackwell publishing limited 3^rd edition 17.
2. Scheiman., et al. Clinical management of binocular vision, Wolters Kluwer, 4^th edition. 234-429.
3. Jameel Rizwana Hussaindeen., et al. “Prevalence of non-strabismic anomalies of binocular vision in Tamil Nadu: report 2 of BAND study”. Clinical and Experimental Optometry 100.6 (2016): 642-648.
4. Scheiman., et al. “A Randomized Clinical Trial of Treatments”. Archives of Ophthalmology 123 (2005): 14-24.
5. Scheiman and Wick (Fourth Edition). Clinical Management of Binocular Vision Heterophoric, Accommodative and Eye movement Disorders. Wolters Kluwer Lippincott Williams and Wilkins (Health). 
6. T Keith Lyle and Kenneth C. Wybar (5^th Ed). Practical Orthoptics in the treatment of squint. Jaypee brothers publication.

Citation

Citation: Gaurav Kumar Bhardwaj and Pinaz Nasim. “Non Strabismic Binocular Vision Anomalies: Whoosh the Diagnosis”.Acta Scientific Ophthalmology 3.2 (2020): 02-04.

Copyright

Copyright: © 2020 Gaurav Kumar Bhardwaj and Pinaz Nasim. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.