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3. Ophthalmic trial frame - Wikipedia

   en.wikipedia.org/wiki/Ophthalmic_trial_frame

   A trial frame is a tool used by ophthalmic professionals like ophthalmologists and optometrists. It is basically an adjustable spectacle frame with multiple cells, used to hold corrective lenses, and other accessories in subjective refraction (finding the correct spectacle power) and retinoscopy.

4. Retinoscopy - Wikipedia

   en.wikipedia.org/wiki/Retinoscopy

   Retinoscopy (Ret) is a technique to obtain an objective measurement of the refractive error of a patient's eyes. [1] The examiner uses a retinoscope to shine light into the patient's eye and observes the reflection (reflex) off the patient's retina.

5. Subjective refraction - Wikipedia

   en.wikipedia.org/wiki/Subjective_refraction

   The entire process of Subjective Refraction involves the patient fixating at the Snellen Chart, whilst the clinician presents a variety of lenses and alters the power of the lenses in the trial frames according to the patient's subjective responses regarding improvements to their vision.

6. Maddox rod - Wikipedia

   en.wikipedia.org/wiki/Maddox_rod

   Double Maddox rod test with trial frames. The room lights should be dimmed and only one light source should be visible. Maddox rods are placed into the trial frames, one before each eye. Cylinders are placed into trial frame vertically, making the two red lines horizontal.

7. Eye examination - Wikipedia

   en.wikipedia.org/wiki/Eye_examination

   Typically, the patient will sit behind a phoropter or wear a trial frame and look at an eye chart. The eye care professional will change lenses and other settings while asking the patient for feedback on which set of lenses give the best vision.

8. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...