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Explain why the fovea has the highest visual acuity?
Light directly hits the fovea's photoreceptors only because other cells are displaced laterally.
Why does light from a near source produce a blurry image on a flattened lens?
light rays converge behind the retina; 6
How do the suspensory ligaments and ciliary muscles adjust for near vision? How does this affect the lens?
suspensory ligament loosen
ciliary muscles contract
greater refractive power (26D)
*eyes must also converge for near vision; 7
Where are the cell bodies of the preganglionic parasympathetic neurons for the ciliary muscle located?
Edinger-Westphal nucleus; 8
Where do the pre- and postganglionic parasympathetic neurons of the ciliary muscle synapse?
ciliary ganglion; 8
What parameter declines with age--leading to a decrease in accommodation ability?
What does 20/800 vision mean?
what the patient can read at 20 feet, an individual with 20/20 vision could read at 800 feet.
What is diabetic retinopathy?
degeneration of blood vessels of the eye that can lead to blindness
*leading cause of acquired blindness in U.S.
Describe the progression that leads to detached retina.
vitreous humor becomes more liquid with age, retinal tear can occur
retinal detachment occurs due to fluid buildup
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