Practice Quiz

Ophthalmic Assistant

Category - Keratometry, Tonometry, and Refractometry

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Which of the following keratometry readings is considered shorthand and thus omits the axis of the flatter meridian?
  1. OD 42.25 x 175 / 43.50 x 85
  2. OD 42.25 / 43.50 x 85
  3. OD 42.25 x 175 / 43.50
  4. OD 175 / 43.50 x 85
Explanation
Answer: B - OD 42.25 / 43.50 x 85

OD 42.25 / 43.50 x 85 is the shorthand form an examiner can use to record keratometry readings. The shorthand form makes assumption that the two readings will always be 90 degrees apart. OD 42.25 x 175 / 43.50 x 85 is the full reading, including the axis of the flatter meridian.
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