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91. In regard to the way rods and cones operate, ______. a. neither rods nor cones pool their signals on the way to bipolar cells b. rods, but not cones, tend to pool their signals on their way to bipolar cells c. cones, but not rods, tend to pool their signals on their way to bipolar cells d. both cones and rods tend to pool their signals on their way to bipolar cells 92. Outside the fovea, visual acuity drops by as much as ______ percent. a. 30c. 70F, b b. 50d. 90 93. In the dark, the fovea is ______. a. almost useless b. about as effective as retinal cells outside the fovea c. as effective as it is in daylight d. much more effective than it is in daylight 94. When John drives his car at night, he finds that he can barely see traffic and street signs if he looks directly at them. He can increase his visual sensitivity by looking at the signs ______. a. out of the side of his eye, because doing so focuses the image on the blind spot b. out of the side of his eye (using more rods) instead of focusing directly on them (using more cones) c. and squinting, which focuses the available light more precisely d. out of the side of his eye (using more cones) instead of focusing directly on them (using more rods) 95. The inability to clearly see objects at a distance is called ______. a. glaucomac. presbyopia b. astigmatismd. myopia 96. The inability to clearly see objects that are close, or highly detailed objects, is called ______. a. glaucomac. presbyopia b. astigmatismd. myopia 97. Blurred vision due to irregularities in the shape of the lens or retina is called ______. a. glaucomac. retinitis pigmentosa b. astigmatismd. macular degeneration 98. A thin, cloudy covering that develops on the surface of the eye is called ______. a. a cataractc. retinitis pigmentosa b. astigmatismd. glaucoma 99. A build up of pressure within the eye that can lead to blindness is called ______. a. glaucomac. retinitis pigmentosa b. astigmatismd. macular degeneration 100. A degeneration of retinal cells, usually in and around the fovea, that eventually causes blindness, is called ______. a. glaucomac. a cataract b.