Certified Ophthalmic Assistant Practice Exam

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What part of the rules for transposition involves changing the axis of the cylinder?

45 degrees
60 degrees
75 degrees
90 degrees

The correct answer is: 90 degrees

Transposition in optometry involves converting a prescription from a negative cylinder form to a positive cylinder form, or vice versa. When changing the axis of the cylinder, the rule is to add 90 degrees to the original axis if converting from a minus cylinder to a plus cylinder, or subtract 90 degrees if converting from a plus cylinder to a minus cylinder. Therefore, the correct answer is D - 90 degrees. In this context, the other options are incorrect because they do not align with the standard rule for changing the axis of the cylinder during transposition.