A Visual Evaluation with Automate Devices by GR Reddy

By GR Reddy

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Extra info for A Visual Evaluation with Automate Devices

Sample text

If the visual field profile of a patient is also smooth like this, the PSD will be close to zero. The lower solid line that is irregular, depicts the visual field of a patient with localized visual field loss. The dashed line represents the adjustment of the visual field profile to account for the average or generalized deviation of the visual field from normal. Here even after adjusting the height of the visual field to account for the average deviation from normal, there are irregular departures from the normal slope.

The third stimulus is too dim to elicit a response and hence indicated by closed circle 3. This is the first crossing from seeing zone to nonseeing zone. Fourth stimulus: Now the machine makes the stimulus brighter but in 2 dB steps. The fourth stimulus was also too dim to elicit a response and hence indicated by closed circle 4. Fifth stimulus: The fifth stimulus is further brightened by 2 dB and this time, the patient pushes the button and hence labeled as open circle 5. This is the second crossing of the threshold from nonseeing zone to seeing zone.

The lower solid line that is irregular, depicts the visual field of a patient with localized visual field loss. The dashed line represents the adjustment of the visual field profile to account for the average or generalized deviation of the visual field from normal. Here even after adjusting the height of the visual field to account for the average deviation from normal, there are irregular departures from the normal slope. 19 is either zero (no departure from the average normal slope of hill of vision) or a positive number.

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