June 19, 2013 | POSTED BY | Clinical Pearls

Did a great refraction but patient hates the prescription when trial framed? Avoid these common trial frame mistakes to ensure your patient is looking through your intended prescription and not seeing a blurry mess:

  1. Vertex distance too large – ophthalmic frames are designed to have a vertex around 13 mm. If your trial frame sits too far away from the patient’s eyes, this will modify the prescription the patient is looking through, especially if he or she is a high myope/hyperope.
  2. Pantoscopic angle is off – make sure the lenses are parallel to the face or bottom slightly slanted towards the face. If the lenses are angled oddly, then the patient’s vision will seem distorted.
  3. Trial frame sits too low on the nose – the patient may be looking through the edge of the trial lens where the quality of vision is not as great as through the center of the lens. Again, the patient’s vision may seem distorted and not as clear as it should be.

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