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Subjects
- Vision, Ocular[remove]54
- Eye8
- Eyeglasses4
- Light4
- Deafness3
- Ear3
- Hearing3
- Vision Disorders3
- Vision Disorders -- prevention & control3
- Equipment and Supplies2
- Hearing Disorders -- prevention & control2
- Military Science2
- Motor Vehicles2
- Ocular Physiological Phenomena2
- Refraction, Ocular2
- United States2
- Vision Tests2
- Visual Perception2
- Aged1
- Anatomy1