Berdine has developed cataracts in both eyes, preventing her from being able to identify even her mother's face. Berdine most clearly suffers a deficiency in

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Cataracts affect the lens of the eye, which is responsible for focusing light on the retina. The retina then sends signals to the brain via the optic nerve. Damage to the optic nerve would prevent signals from reaching the brain, but Berdine is still able to see, so her optic nerve is not damaged. Accommodation is the ability to focus on objects at different distances, and kinesthesis is the sense of body position and movement. Bottom-up processing is the process of interpreting sensory information from the environment, which is what Berdine is having difficulty with due to her cataracts.

Berdine Has Developed Cataracts in Both Eyes, Preventing Her from Being