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Video color perimetry: impairment in glaucoma suspects
N Accornero1, M Capozza, A De Feo
1Dipartimento di Science Neurologiche, University of Rome La Sapienza, Italy. naccornero@uniromal.it
Purpose:
To detect mild visual field impairment in asymptomatic glaucoma suspect patients.
Methods:
Color perception within the visual field was tested with customized color video perimetry. The key features of the system were stimuli color desaturation, low-level luminance and equiluminant gray background. Twenty patients with asymptomatic glaucoma were tested and compared with a group of age-matched control subjects.
Results:
Automated perimetry test findings differed significantly in the two groups, particularly for short-wavelength sensitivity (blue). The severity of color impairment correlated directly with intraocular pressure.
Conclusion:
Desaturated low-luminance video perimetry will reliably detect and quantify asymptomatic visual field defects. A previous work on multiple sclerosis has detected a mild long-wavelength (red) impairment in asymptomatic patients after an episode of optic neuritis, even in clinically unaffected fellow eyes. Our findings in glaucoma suspect patients indicate that a mild blue impairment could be the initial sign of this disease.