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Related to optic axis: double refraction
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This can be demonstrated by locating the unique "index" ommatidium, which is the ommatidium with its optic axis horizontal and normal to the body axis of the crab.
After isolating the response of a single optic nerve fiber, we align the animal so that the optic axis of the recorded ommatidium views the center of the pattern.
Large geometry means the lenses have a dimension to the perpendicular optic axis of at least 5 mm compared with previous values of 0.