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Stereoacuity in mild, moderate and severe glaucoma
Author(s) -
Lakshmanan Yamunadevi,
George Ronnie J
Publication year - 2013
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.12021
Subject(s) - stereoscopic acuity , medicine , ophthalmology , visual field , visual acuity , optometry
Purpose To determine the association between stereoacuity and severity of glaucoma. Methods Stereoacuity was measured using the T itmus stereo test for 97 glaucoma subjects with visual acuity better than 0.3 log MAR (6/12, 20/40 S nellen) and reliable H umphrey visual fields (24‐2 SITA standard). The severity of visual fields was graded with the H odapp‐ A nderson‐ P arrish ( HAP ) classification and visual fields index ( VFI ) score and the stereoacuities for different grades were compared. Presence of a significant field defect ( p < 1%) in any one of the paracentral points in 10–2 SITA standard/Macular threshold was considered as a threat to fixation. Results Mean ± SD age of the subjects was 57.28 ± 14.0 years. The median [inter‐quartile range, ( IQR )] stereoacuity of the 97 subjects was 50 (40–100) arc sec with 13 subjects having stereoacuity of >3000 arc sec. Median ( IQR ) stereoacuity of 97 subjects classified with HAP as mild, moderate and severe were 40 (40–40), 50 (40–60) and 60 (40–400) arc sec; similarly median ( IQR ) stereoacuity of the subjects classified using VFI as mild, moderate and severe were 40 (40–55), 60 (40–100) and 120 (50–3000) s of arc and the difference between groups were significant ( p < 0.001). Median ( IQR ) stereoacuity in subjects with no threat to fixation (45) and threat to fixation in at least one eye (52) were 40 (40–60) and 70 (40–800) arc sec ( p < 0.001). Conclusions Decreased stereoacuity was associated with greater glaucomatous visual field loss, although it was normal with early visual field defects. Relatively moderate defects can be associated with decreased stereoacuity and it is more pronounced in the severe stages of the disease when there is a threat to fixation.