Visual Adaptation

	LEA™ Grating Acuity Test A Resolving/Discrimination TestThis test at full contrast requires discrimination of the direction of long lines, which is a more demanding task than the detection acuity measured with Lea GRATINGS. The test gratings are presented to children and adults at different distances to determine...
	LEA™ Low Contrast Grating Acuity Test Measurement of contrast sensitivity curve is based on 4 gratings at 2 contrast levels, 10%, and 2.5% contrast using 2 grating frequencies: 0.5 cpcm and 8 cpcm (10% level) or 0.5 cpcm and 4 cpcm (2.5% level). Testing is based on finding the distance where the person is at threshold in...
	LEA GRATINGS®, a Preferential Looking Test LEA GRATINGS® are for preferential looking test situations with infants or children and adults with disabilities to determine detection acuity. Grating levels printed on each handle are: 0.25, 0.5, 1.0, 2.0, 4.0 and 8.0 cpcm (cycles per centimeter of surface).Includes instructions...
	Cone Adaptation Test The test consists of 15, 2" x 2" (5 cm x 5 cm) red, blue, and white plastic chips designed to help parents, teachers, and doctors assess children’s visual difficulties in twilight. The test situation is not a formal test of night vision, but gives useful information on visual adaptation...

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