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A low contrast test is a special way to measure visual acuity by determining how well eyes function in low light situations and/or the ability to distinguish objects from similarly colored or shaded backgrounds. Testing is identical to the measurement of visual acuity at high contrast levels. The 2.5% test is the most practical test in clinical use. Available in 5 contrast levels: 1.25%, 2.5%, 5%, 10%, and 25%. LEA SYMBOLS® charts include response key. All contrast charts include recording forms and instructions.
A LEA SYMBOLS®
1.25% (not shown) 253700
2.5% (shown) 253800
5% (not shown) 253900
10% (not shown) 254000
25% (not shown) 254100
B LEA NUMBERS®
1.25% (not shown) 271500
2.5% (shown) 271600
5% (not shown) 271700
10% (not shown) 271800
25% (not shown) 271900
C Sloan Letters
1.25% (not shown) 600754
2.5% (shown) 600753
5% (not shown) 600752
10% (not shown) 600751
25% (not shown) 600750