Which pigment's decreased formation contributes to decreased dark adaptation in older adults?

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Multiple Choice

Which pigment's decreased formation contributes to decreased dark adaptation in older adults?

Explanation:
Dark adaptation depends primarily on the rod photopigment rhodopsin. In darkness, rhodopsin must be regenerated so rods regain sensitivity to low light. As people age, the formation or regeneration of rhodopsin slows, reducing rod responsiveness in dim conditions and making dark adaptation slower. Iodopsin is the cone pigment used for bright-light vision and color; it isn’t the limiting factor in adapting to darkness. Melanin isn’t a photopigment and doesn’t drive dark adaptation. So, decreased formation of rhodopsin best explains the reduced dark adaptation seen in older adults.

Dark adaptation depends primarily on the rod photopigment rhodopsin. In darkness, rhodopsin must be regenerated so rods regain sensitivity to low light. As people age, the formation or regeneration of rhodopsin slows, reducing rod responsiveness in dim conditions and making dark adaptation slower. Iodopsin is the cone pigment used for bright-light vision and color; it isn’t the limiting factor in adapting to darkness. Melanin isn’t a photopigment and doesn’t drive dark adaptation. So, decreased formation of rhodopsin best explains the reduced dark adaptation seen in older adults.

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