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Prism Compensating Device: Place the optical center of the lens in the lens stop. Set the power drum to the power of the lens. If there is over five Δ of prism rotate the PCD to bring the target into the center of the reticle.

The power of an ophthalmic prism (glass or plastic) in prism diopters (Δ) is equal to the deviation, in centimeters (cm), of a light ray passing through the prism, measured one meter, or 100 cm, away from the prism [Figure 1].

Prism is prescribed to correct for problems with eye alignment. This is measured in prism diopters ("p.d." or a superscript triangle when written freehand) and written in ¼ diopter increments (I.E. 0.25, 0.50, 0.75, 1.00). Unlike SPH and CYL, there are no (+) or (-) signs.

How to read prism on a manual lensometer Mark the interpupillary distance on the lenses. Center the mark for the right lens on the lens stop. Record the amount and direction of the crosshair decentration (see Figure 2, right lens, showing 2pd BI). Repeat for left lens.

0:15 2:18 Using a lensometer part 2 , measuring prism - YouTube YouTube Start of suggested clip End of suggested clip Right so you tell me what's the amount of prisms. Well it's three three prism diopters. So happensMoreRight so you tell me what's the amount of prisms. Well it's three three prism diopters. So happens that it shifts from here all the way to here. So you have three.

How to read prism on a manual lensometer Mark the interpupillary distance on the lenses. Center the mark for the right lens on the lens stop. Record the amount and direction of the crosshair decentration (see Figure 2, right lens, showing 2pd BI). Repeat for left lens.

The formula used to calculate the amount of prism is called Prentice's Rule. The formula for Prentice's Rule is: Prism (diopters) = Power (diopters) X Decentration (centimeters). Prentice's Rule can be used to create prism in a lens. As opticians, we are trained to optimize a patient's vision.

0:41 5:41 Manual Lensometer Part 2 - YouTube YouTube Start of suggested clip End of suggested clip Move the lens such that the lens is as much as possible towards the centerline in the optical. ZoneMoreMove the lens such that the lens is as much as possible towards the centerline in the optical. Zone adjust the lens stable. Rotate the power drum until the target is sharp and clear.

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