Abstract
Fifty eyes of fifty patients with ocular hypertension had their visual fields tested on a Friedmann Mark 1 field analyser whilst wearing a Wratten 47B blue filter in a spectacle frame. All had normal visual fields to a white stimulus. Use of a scoring system with the blue field identified 11 patients (22%) with ocular hypertension as abnormal. The scores from this subgroup were indistinguishable from a group of subjects with early glaucoma-tous field loss, whilst the remaining scores were similar to normal subjects. These two subgroups of ocular hypertensive patients were similar in age and intraocular pressure. The use of a blue filter in front of the eye may offer a simple test to identify a subgroup of patients with ocular hypertension who are at increased risk of developing field loss.
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Hugkulstone, C., Vernon, S. Blue versus white stimuli in ocular hypertension with the Friedmann Mark 1 visual field analyser. Eye 6, 356–360 (1992). https://doi.org/10.1038/eye.1992.73
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DOI: https://doi.org/10.1038/eye.1992.73