OEBC OSCE Component Practice Questions - Optometry Examining Board Of Canada Entry-to-Practice Examination - OSCE Component Exam

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During a contact lens station, an examiner asks you to fit a soft toric contact lens for an astigmatic patient. After insertion, the lens mislocates 10 degrees to the clinician's LEFT (clockwise rotation). According to the LARS rule (Left Add, Right Subtract), how should the SPECTACLE CYLINDER AXIS of 180 degrees be adjusted for the ordered contact lens?

Order an axis of 010 degrees (180 + 10 = 010) Order an axis of 170 degrees (180 - 10 = 170) Order an axis of 090 degrees Maintain the axis at 180 degrees with double the cylinder power

Correct Answer:

Order an axis of 010 degrees (180 + 10 = 010)

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