Exercise 18.17: Vision Tests 23. An individual has the following results on a visual acuity test: 20/10. This individual's vision is. 24. As we age, the flexibility of the lens of the eye decreases. This causes the near point of accommodation to move (farther from/closer to) the eye. 25. The area of the retina that completely lacks photoreceptors and therefore cannot detect the source of light is the 26. Color blindness can have multiple causes, including a reduced distribution or defective function of the (better/wo
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3. A person with 20-100 vision has (normal/abnormal) vision. 4. Abnormal curvature of the cornea or lens is called _?_. 5. The ability to adjust the focusing apparatus of the eye to account for changes in distance from the viewed object is called _?_. 6. When accommodating, the pupil and the _?_ may change shape. 7. The blind spot is actually the _?_. 8. Black-and-white vision is also called _?_ vision. 9. Rods are involved in (bright-light/dim-light) vision. 10. Cones are involved in (bright-light/dim-light) vision. 11. Rods are involved in (black-and-white/color) vision. 12. Cones are involved in (black-and-white/color) vision. 13. Individuals with a lack of green-sensitive cones are said to have _?_, a form of red-green color blindness. 14. Individuals with a lack of red-sensitive cones are said to have _?_, a different form of red-green color blindness. 15. Color blindness usually results from _?_.
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A patient's visual acuity was tested using a Snellen chart. The results indicated that her vision was 20/50. What does this result mean? Following eye surgery, a man was required to wear an eye patch over his right eye. What effect will this patch have on the man's vision? During a test for near-point accommodation, Subject A had an accommodation distance of 15 cm in both eyes, and Subject B had an accommodation distance of 30 cm. Which one is likely the younger person? Explain.
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