Part 10 · Neurophysiology I — Sensory Systems and Special Senses
Same concept, other depth: Foundation →
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Power (D) = 1/f (m). Total ~60 D: cornea ~43 D (largest refractive index step, air–tear film), lens ~20 D (variable). Near point recedes with age as lens elasticity falls (amplitude of accommodation ~14 D at 10 years, ~4 D at 40, ~1 D at 60 → presbyopia). Pinhole improves acuity only for refractive error.
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