Macular Health Contrast Sensitivity Charts
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$7.00
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Contrast sensitivity provides a way of assessing visual function that is more sensitive than conventional targets...
Rev. Dr. Glen Swartwout has developed these charts for clinic and home monitoring of central visual function and macular health...
Both the neutral gray and the red chart are marked on each of the four sides with an "O" that can be used to standardize the viewing distance...
Simply look continuously at the center of the chart with one eye at a time, and move the chart nearer or further until the "O" to the side of the eye being used disappears from view...
That means when using your right eye, the "O" to your right will disappear when it's image on your retina is aligned with your optic nerve head and its physiological (normal) blind spot.
For your left eye, the "O" on your left will disappear...
You can also turn each chart 90 degrees to assess any effects on vertical versus horizontal contrast sensitivity sinusoidal waveforms...
Look for locally blurry, wavy, distorted or missing parts of any lines, and record the areas affected...
Cover but do not press on the other eye while using the chart with each eye...
Rev. Dr. Glen Swartwout has developed these charts for clinic and home monitoring of central visual function and macular health...
Both the neutral gray and the red chart are marked on each of the four sides with an "O" that can be used to standardize the viewing distance...
Simply look continuously at the center of the chart with one eye at a time, and move the chart nearer or further until the "O" to the side of the eye being used disappears from view...
That means when using your right eye, the "O" to your right will disappear when it's image on your retina is aligned with your optic nerve head and its physiological (normal) blind spot.
For your left eye, the "O" on your left will disappear...
You can also turn each chart 90 degrees to assess any effects on vertical versus horizontal contrast sensitivity sinusoidal waveforms...
Look for locally blurry, wavy, distorted or missing parts of any lines, and record the areas affected...
Cover but do not press on the other eye while using the chart with each eye...