ABSTRACT NUMBER - 173

Using an iPad device to test the visual fields of patients with neuro-ophthalmic diseases.


Jonathan Goh

Meeting:  2015 RANZCO


SESSION INFORMATION

Date:      -

Session Title: Neuro-Ophthalmology/Paediatrics Rapid Fire

Session Time:      -

Purpose: Determine the accuracy and repeatability of an iPad application (Melbourne Rapid Field, MRF) in defining visual field defects found by Humphrey Visual Field (HVF) perimetry secondary to neuro-ophthalmic disease.

Methods: Thirteen participants with visual field defects secondary to neuro-ophthalmic disease established with HVF SITA 24-2 were tested on the same day using the MRF. Participants were grouped on etiology of their eye disease; optic neuritis (ON) or non-optic neuritis (NON). Four NON-participants were retested on the MRF, 5 minutes later.

Results: The 13 participants comprised 7 ON (9 eyes) and 6 NON (7 eyes). 15 eyes showed abnormal VFs and one had normal VF (after full recovery) on HVF (MD range -22.71 to -0.04) and MRF (MD range -19.18 to 0.26). There was no significant difference in test duration between the HVF (4.95±0.99 mins) and the MRF (5.37±1.28 mins), nor†in false positives, false negatives, or fixation losses. In the ON group there was moderate correlation between the two tests in mean deviation (MD) (R=0.67) and pattern deviation (PD) (R=0.67). In the NON group there was excellent correlation in MD(R=0.94) and PD(R=0.94). The four NON participants who underwent two MRF tests returned excellent repeatability for MD(R=0.99) and PD(R=0.99).

Conclusion: MRF provides high diagnostic accuracy and strong correlation with the HVF test in terms of MD and PD in neuro-ophthalmic diseases that gives highly repeatable outcomes. This application may prove useful in situations where a HVF test is unavailable or unsuitable (e.g. in an emergency department or for bedbound patients).