A patient reports having difficulty discriminating colors after being prescribed hydroxychloroquine (Plaquenil). What information should the nurse provide?
1. Keratometry can be done to diagnose color blindness.
2. The Ishihara test is simple and can reveal color blindness.
3. Invasive testing will be required to assess cones and rods.
4. A picture of the ocular fundus will be necessary to make this diagnosis.
2
Rationale 1: Keratometry detects astigmatism, not color blindness.
Rationale 2: The Ishihara test uses color plates that the patient views. Color blindness can be diagnosed with this test.
Rationale 3: Invasive testing is not necessary to diagnose color blindness.
Rationale 4: It is not necessary to take a picture of the ocular fundus for this diagnosis.
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