A thick fluid called the aqueous humor fills the eyeball posterior to the lens and helps maintain the eyeball shape.
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Q17: Color vision is made possible by photoreceptors
Q18: Macular degeneration affects the central part of
Q19: Most cases of astigmatism can be treated
Q20: Risks for _ can be reduced by
Q21: Light entering the eye first passes through
Q23: Treatment for _ may include hearing aids
Q24: To prevent _, foreign objects should not
Q25: Ringing in the ears is known as
Q26: In myopia, the eyeball grows too long
Q27: Retinoblastoma is a rare, _ tumor of
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