1. The leading cause of blindness is known as: a. stye. b. glaucoma. c. presbyopia. d. cataract. 2. A specialized instrument that measures hearing acuity at different frequencies is the: a. tuning...

1. The leading cause of blindness is known as: a. stye. b. glaucoma. c. presbyopia. d. cataract.

2. A specialized instrument that measures hearing acuity at different frequencies is the: a. tuning fork. b. tympanometer. c. audiometer. d. Rinne tester.