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A. Pollack, H. Katz, Y. Manor; Performance of Elderly Subjects in Self Operation of Home Macular Perimetry (HMP) Test. Invest. Ophthalmol. Vis. Sci. 2008;49(13):258.
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The Home Macular Perimetry (HMP) device (Notal Vision Inc, Israel) used in this study is a portable home perimeter designed to monitor the macular visual field of intermediate AMD patients. The HMP runs a computerized test that makes use of the hyperacuity visual function. The test is based on the psychophysical phenomenon of preferential looking.The objective of the study is to estimate the percentage of healthy people matching the AMD age group, that have prior knowledge with PC usage, who are able to self operate the Home Macular Perimetry test in a home simulated environment
25 healthy, elderly mouse users, were enrolled for this study. Subjects were expected to follow unsupervised instructions and perform a set of operations that demonstrated the ability to self-operate the HMP. The study was divided to 2 conceptual stages, each stage separately evaluated for success rate: Stage 1 included unpacking, installation, tutorial and calibration of the HMP test. This final step consisted of finding the threshold level of hyperacuity stimuli. A minimal requirement of a threshold level equal or below 0.25 degree was used as a measure for success in this stage. Individuals who successfully graduated Stage 1 were recruited to Stage 2. Stage 2 consisted of a series of 3 tests performed in 3 consecutive days. The sensitivity of the test was determined by the threshold level found in Stage 1. Success in this stage was defined as the ability to reliably perform at least 2 of the 3 tests.
Of 25 (Avg. age 73±11.6) subjects who were enrolled for the study, 22 (88%) calibrated the HMP test below the minimal requirement and therefore successfully graduated Stage 1. 3 of 25 (12%) subjects abandoned the study during the initial steps of Stage 1. Of 22 subjects who were recruited for stage 2, 22 (100%) performed 3 of 3 reliable tests and hence graduated Stage 2.
The HMP device is easy to use and can be self-operated by most elderly who are familiar with PC usage. in a home simulated environment.
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