A Novel Approach to Measure Binocular Visual Fields in Glauc
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Combined average visual field index is a simple, novel tool for binocular visual field which agrees with the existing binocular integrated visual field model, as well as patient reported activity limitation in glaucoma.

This study aimed to determine the correlation between novel models of binocular visual field with the existing integrated visual field (IVF) and glaucoma activity limitation.

Integrated visual fields were calculated from the monocular visual fields of 58 patients with primary glaucoma and the novel binocular visual field models termed binocular summation visual field index (BiSumVFI) and combined average visual field index (CaVFI) were derived from the visual field indices (VFI) of both fields. Glaucoma activity limitation (GAL-9) questionnaire was administered to the patients. The relationship between IVF and the two newer models of binocular fields were determined and the correlation of IVF, BiSumVFI and CaVFI with GAL-9 was estimated.

Results:
--A very strong correlation was seen between IVF and BiSumVFI (r=-0.913) and also between IVF and CaVFI (r= 0.896).

--Linear regression analysis showed a significant R2 of 0.902 to predict IVF from BiSumVFI and R2 of 0.847 to predict IVF from CaVFI.

--IVF, BiSumVFI and CaVFI correlated moderately and significantly with Glaucoma activity limitation with correlation coefficients of 0.481, -0.499 and -0.505 respectively.

Finally, in glaucoma, binocular visual field models including the binocular summation visual field index and the cumulative average visual field index are strong predictors of integrated visual field. They fit well with the new integrated visual field model in predicting patient expectations of movement restriction in glaucoma.

Source: https://journals.lww.com/glaucomajournal/Abstract/9000/A_Novel_Approach_to_Measuring_Binocular_Visual.97605.aspx
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