By GR Reddy
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Additional info for A Visual Evaluation with Automate Devices
Step 1 : Selection of 7th best retinal sensitivity point of TDNP The most important key point for the conversion of total deviation numerical plot to pattern devia tion numerical plot is the selection of 7th best retinal sensitivity point in the total deviation numerical plot. (TDNP) Before selecting 7th best retinal sensitivity point in TDNP the following points are to be noted. 1. The three points nearer to the blind spot are ignored. 2. In 30-2 point pattern only points of 24-2 point pattern (the subset of 30-2 point pattern) is considered after ignoring the 3 points nearer to the blind spot.
Because the test points fall under horizontal and vertical axes it leaves 6° bare area of test points, surrounding the fixation spot. So the central 6° field in 30-1 is not tested. Area of 6° radius around fixation spot is free of test points in 30-1 central field and hence the 6° area will not be tested. 16 Fixation spot Bare area of 3° radius around fixation spot in 30-2 central field Number of test points - 76. The distance between each two points is 6° (the point density is 6°). The test points straddle the horizontal and vertical axes.
Refractive Error The patient’s near vision refractive error must be properly corrected. Otherwise the visual field will show generalized depression. Besides not only correcting the refractive error for near vision, but also we should see that the glasses are properly placed in the trail frame of the automated perimeter and the correcting lens should be very close to the testing eye. Otherwise it can produce artefacts. If visual acuity explains the measured foveal threshold of the patient and vice versa, it indicates that the refractive error correction for near vision is proper.
A Visual Evaluation with Automate Devices by GR Reddy