Snellen chart

In all these tests, the men were asked to read Snellen chart numbers as soon as possible after opening their eyes. In the chamber test with CS aerosols, an Orthorater (Bausch and Lomb vision tester) was used to measure near and far visual acuity. All the treated eyes were then examined by ultraviolet and slitlamp procedures to detect corneal injury. The results of all three experiments may be summarized as follows There were fairly wide variations in the times... 

Aidman Vision Screener. The aidman vision screener is an informal test that can be used to assess the function of the eye by an army medic. The test(s) are function based and result in evacuation recommendations. The tests consist of a near visual acuity test, such as a random E chart or Snellen chart (Figure 6-H), and an Amsler Grid (Figure 6-1) visual field test. For soldiers who report being exposed to a laser source, the aidman screener offers a quick laser injury recognition tool (Table 6-F). 

INSTRUCTIONS When other than the Snellen chart Is used, give test results In Snellen-comparable values. In recording distance vision, use 20 feet as normal. Report visual acuity as a ratio with 20 as numerator and the smallest type read at 20 feet as denominator. If the applicant wears corrective lenses, these should be worn while visual acuity is being tested. If the driver habitually wears contact lenses, or intends to do so while driving, sufficient evidence of good tolerance and adaptation to their use must be obvious. Monocular drivers are not qualified. 

Medical problems and visual acuity (Snellen Chart)... 

The visual acuity was determined using the standard Snellen chart. 

Ethambutol should not be given with antacids. The ethambutol dose should be reduced to three times per week in patients with renal failure. Retrobulbar neuritis is the major adverse effect. Patients may complain of a change in visual acuity, the inability to see the color green, or both. They should be monitored monthly while on the drug using Snellen wall charts for visual acuity and Ishihara red-green color discrimination cards. ... 

---