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Bitemporal hemianopia; its unique binocular complexities and a novel remedy
Author(s) -
Peli Eli,
Satgunam PremNandhini
Publication year - 2014
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/opo.12118
Subject(s) - diplopia , binocular vision , visual field , stereopsis , optometry , ophthalmology , medicine , psychology , audiology , artificial intelligence , computer science
Bitemporal hemianopic visual field impairment frequently leads to binocular vision difficulties. Patients with bitemporal hemianopia with pre‐existing exophoria complain of horizontal diplopia, sometimes combined with vertical deviation (with pre‐existing hyperphoria). The symptoms are a result of the phoria decompensating into a tropia (hemi‐slide) due to the lack of retinal correspondence between the remaining nasal fields of both eyes. We measured these effects using a dichoptic perimeter. We showed that aligning the eyes with prisms could prevent diplopia if the bitemporal hemianopia is incomplete. We also describe the successful use of a novel fusion aid – the ‘stereo‐typoscope’ – that utilizes midline stereopsis to prevent diplopia resulting from hemi‐sliding in patients with complete bitemporal hemianopia.