Final answer:
Option (B), The monocular field crescents refer to the portion of the visual field that is visible to only one eye. The proportion of the total binocular visual field covered by the monocular field crescents is 15%.
Step-by-step explanation:
The monocular field crescents refer to the portion of the visual field that is visible to only one eye. Since each eye has a total visual field of 180 degrees, the monocular field crescents would be the remaining portion that is not covered by the binocular field. The binocular field is the area of overlap between the visual fields of both eyes.
To find the proportion of the total binocular visual field covered by the monocular field crescents, we need to calculate the angle of the binocular field. If we assume the binocular field is a circular shape, then the angle of the binocular field would be 180 degrees. Since the monocular field crescents are the remaining portion, the proportion would be:
Proportion = Angle of monocular field crescents / Angle of binocular field
Proportion = (180 - Angle of binocular field) / Angle of binocular field
Therefore, the correct answer is option B) 15%.