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Justify/Contradict: Brightness discrimination is poor at low levels of illumination.

written 8.5 years ago by teamques10 ★ 68k

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written 8.5 years ago by teamques10 ★ 68k

1. The ability of the eye to discriminate between changes in light intensity at any specific adaptation level is different.
2. The brightness discrimination of the eye can be given by Weber ratio ΔI/I where ΔI is the increment of illumination discrimination 50% of the time with background illumination I.
3. mSmall ΔI/I indicate good brightness discrimination and large ΔI/I indicate poor brightness discrimination.
4. Brightness discrimination is poor at low levels of illumination because vision is carried out by activity of rods and at high levels it is by cones in the eye.

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