Abstract
PurposeWe developed a new portable head-mounted perimeter, “imo”, which performs visual field (VF) testing under flexible conditions without a dark room. Besides the monocular eye test, imo can present a test target randomly to either eye without occlusion (a binocular random single eye test). The performance of imo was evaluated.MethodsUsing full HD transmissive LCD and high intensity LED backlights, imo can display a test target under the same test conditions as the Humphrey Field Analyzer (HFA). The monocular and binocular random single eye tests by imo and the HFA test were performed on 40 eyes of 20 subjects with glaucoma. VF sensitivity results by the monocular and binocular random single eye tests were compared, and these test results were further compared to those by the HFA. The subjects were asked whether they noticed which eye was being tested during the test.ResultsThe mean sensitivity (MS) obtained with the HFA highly correlated with the MS by the imo monocular test (R: r = 0.96, L: r = 0.94, P < 0.001) and the binocular random single eye test (R: r = 0.97, L: r = 0.98, P < 0.001). The MS values by the monocular and binocular random single eye tests also highly correlated (R: r = 0.96, L: r = 0.95, P < 0.001). No subject could detect which eye was being tested during the examination.ConclusionsThe perimeter imo can obtain VF sensitivity highly compatible to that by the standard automated perimeter. The binocular random single eye test provides a non-occlusion test condition without the examinee being aware of the tested eye.
Highlights
Visual field (VF) testing is essential in diagnosing and monitoring many ophthalmological and neurological diseases
The mean sensitivity (MS) obtained with the Humphrey Field analyzer (HFA) highly correlated with the MS by the imo monocular test (R: r = 0.96, L: r = 0.94, P < 0.001) and the binocular random single eye test (R: r = 0.97, L: r = 0.98, P < 0.001)
The binocular random single eye test provides a non-occlusion test condition without the examinee being aware of the tested eye
Summary
Visual field (VF) testing is essential in diagnosing and monitoring many ophthalmological and neurological diseases Automated perimeters such as the Humphrey Field analyzer (HFA) (Carl Zeiss Meditec, Dublin, CA) and Octopus perimeter (Haag-Streit, Koeniz, Switzerland) have been widely used in the field of standard automated perimetry (SAP). Most of these perimeters are stationary type devices that need to be used in a dim testing room with light control. Several head-mounted perimeters that do not require a dark room for VF testing have been previously developed for laboratory-based studies[1,2,3]. As a unique feature of this device, the test target is randomly presented to either eye without occlusion and without the examinee being aware of which eye is being tested (the binocular random single eye test)
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