Edwin is able to see normally in low-light conditions and demonstrates a normal ability to detect movements in his periphery. However, he has great difficulty recognizing different colors. He sees the world mostly in shades of gray. Which structure is either impaired or not present in Edwin's eyes?
a. fovea
b. cornea
c. rods
d. cones
Question 2
When trying on new glasses at Lensmasters, Kevin remarks that he can see more details when he looks directly at the letter chart rather than when he looks from the side of his eye. Dr. Eyenstein says, Well Kevin, that happens because your ____ is greatest in the ____.
a. visual acuity; optic chiasm
b. visual acuity; fovea
c. retinal disparity; optic chiasm
d. retinal disparity; fovea
Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event
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