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Ortho-K Lens

Trial Lens Fitting

All the trial lenses from E & E Optics are custom cut lens. We do not keep stock on any lens design. Eye care professionals might ask the trial set be cut for different target, diameter, material, color. The use of trial lenses is to find out “the best fitting” alignment curve. You select a trial lens having the closest flat K to the patient’s central flattest K. If the trial lens is good fitted, you will find the alignment curve parallels the cornea by showing a light touching on Fluorescein pattern. The lens should move 1 to 2 mm when blinking.

If the lens is too tight or too loose, you should change the trial lens K to one step looser or steeper.

If the trial lens fit appropriated, the fluorescein pattern should show central bearing on the base curve (compression zone) and a ring of green color pooling on the fitting zone. The alignment zone will have close to a 360-degree light bearing. The edge of the lens (peripheral curve) should have a band of green color fluorescein to allow the tears to pump under the lens for long-term corneal health.

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