Visual Tests and Demonstrations
MATERIALS NEEDED
Snellen eye chart 3" x 5" card (plain)
3" x 5" card with word typed in center astigmatism chart meter stick metric ruler pen flashlight
Ichikawa's or Ishihara's color plates for color-blindness test
Normal vision (emmetropia) results when light rays from objects in the external environment are refracted by the cornea and lens of the eye and focused onto the photoreceptors of the retina. Irregular curvatures in the surface of the cornea or lens, inability to change the shape of the lens, or defects in the shape of the eyeball can result in defective vision.
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