Jaeger test types


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Jae·ger test types

(yā'gĕr),
type of different sizes used for testing the acuity of near vision.

Jae·ger test types

(yā'gĕr test tīps)
Print of different sizes used for testing the acuity of near vision.

Jaeger,

Eduard, Ritter von Jaxtthal, Austrian ophthalmologist, 1818-1884.
Jaeger hook
Jaeger keratome knife
Jaeger lid plate
Jaeger lid retractor
Jaeger reading chart
Jaeger strabismus hook
Jaeger test types - type of different sizes used for testing the acuity of near vision.

Jaeger test types

Test types for measuring visual acuity at near. They consist of ordinary printers' types of various sizes and are arranged as words and phrases. Depending on the size of test types read, acuity is recorded as J.1, J.2 in ascending size up to J.20. The smallest Jaeger (J.1) subtends an angle of 5′ at 450 mm from the eye. See near visual acuity.
Table J1 Approximate relationship between the Jaeger system, the point system (or N notation) and the Snellen equivalent
Snellen equivalent at 40 cm
Jaegerpoint(m)(ft)
13.56/720/23
24.56/820/27
35.56/1120/37
46.56/1320/43
57.56/1420/47
686/1520/50
79.56/1720/57
8116/2020/67
9126/2420/80
10136/2620/87
11146/2820/93
12166/3020/100
13186/3620/120
14226/4520/150