In normal subjects, the ratio of the horizontal diameter of the physiologic cup to the diameter of the optic disc should be no more than?

Review Topic

Incorrect. This ratio is on the low end. Try again!
Incorrect. Many people have this ratio, but it is not the upper limit of normal. Try again!
Correct. Having a ratio greater than 0.5 may be normal, but you must begin to wonder if it is abnormal. In other words, maybe the physiologic cup occupies too much space and the neuroretinal rim occupies too little space. A possible cause of a cup-to-disc ratio higher than 0.5 is glaucoma. To make that diagnosis, however, you would need more information.
Incorrect. This ratio is well above the upper limit of normal, causing you to be very suspicious of glaucoma. Try again!