Perimetry and imaging in glaucoma diagnosis: a pilot study

Abstract

Aim: To compare the findings from Humphrey Matrix and Rarebit (RB) perimetry in relation to the results from Heidelberg confocal laser scanning retina tomography (HRT II). Material: Data from 22 eyes (12 subjects, age 51–75 years) with known or suspected glaucoma were analyzed. Methods: The central 30° visual field was examined with two perimetric techniques; Humphrey Matrix, using frequency doubling technology, and the RB test, relying on the detection of very small bright dots on a dark background. In addition, all subjects underwent laser scanning tomography of the optic nerve head. Results: There was no significant difference regarding the number of normal/abnormal findings between Humphrey Matrix and RB perimetry (9/22 and 8/22, respectively). Abnormal glaucoma index from the HRT II was observed in 5/22 eyes. In four of these, both Humphrey Matrix and RB perimetry were abnormal. In one eye both with abnormal HRTII, both perimetric tests were normal. Conclusion: This pilot study indicates that the studied perimetric methods appear to give equivalent results in glaucoma, despite the considerable difference in test principles.