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J.E. Manns, A. Madu, J. Bigles, R. Mammo, A. Flery, J. Gurland, M. Mayers; Correlation Between Mars Letter Contrast Sensitivity, Humphrey Visual Field, Frequency Doubling Technology Visual Field and Intraocular Pressure in Patients With Glaucoma. . Invest. Ophthalmol. Vis. Sci. 2006;47(13):3993.
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© ARVO (1962-2015); The Authors (2016-present)
Contrast sensitivity is important for determining disability especially among patients with progressive visual impairment. Despite its importance, it is difficult and not routinely performed. The Mars contrast sensitivity testing (CST) is a small, easier standardized scoring test performed at a comfortable testing distance. The purpose of this study was to explore the correlation between Mars CST, visual fields and IOP in glaucoma patients with a visual acuity of 20/40 or better.
We evaluated 64 eyes from 32 patients recruited from Bronx Lebanon Hospital eye clinic. Patients with glaucoma, glaucoma suspect, or ocular hypertension and with a Snellen visual acuity of 20/40 or better were included. Controls did not have glaucoma based on normal optic nerve, IOP and visual fields, with a Snellen visual acuity of 20/40 or better. Contrast sensitivity was measured using the Mars CST in conjunction with a reproducible and standardized light source. Visual fields were measured using the 24–2 full–threshold program on the Humphrey Visual Field Analyzer and by the N–30 full–threshold program on the FDT visual field analyzer. IOP was measured by Goldmann applanation tonometry.
There was a statistically significant difference between contrast sensitivity in patients with glaucoma and control group (p=0.002). Contrast sensitivity was negatively correlated with IOP (r = –0.342, p=0.022). FDT was positively correlated with HVF ( r= 0.632, p=0.000). HVF was negatively correlated with IOP (r=–0.318,p=0.035).
Consistent with the literature, patients with glaucoma have poor contrast sensitivity when compared to normal controls with similar Snellen visual acuity. The Mars contrast sensitivity is user friendly and correlates well with both HVF and FDT in patients with glaucoma and ease of use should encourage contrast sensitivity testing in assessing visual function.
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