A parent calls the school nurse with questions regarding the recent school vision screening. Snellen chart examination revealed 20/60 for both eyes. Considering the visual acuity results, the nurse informs the parent that the child
a. Should have an optometric examination.
b. Is suffering from strabismus.
c. May have presbyopia.
d. Has vision issues most likely due to cataracts.
ANS: A
Normal vision is 20/20. The larger the denominator, the poorer the patient's visual acuity. For example, a value of 20/60 means that the patient, when standing 20 feet away, can read a line that a person with normal vision can read from 60 feet away. Strabismus is a (congenital) condition in which both eyes do not focus on an object simultaneously: These eyes appear crossed. Acuity may not be affected. Presbyopia is impaired near vision that occurs in middle-aged and older adults and is caused by loss of elasticity of the lens. Cataracts develop slowly and progressively after age 35 or suddenly after trauma.
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