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For every 2 degrees of pantoscopic tilt the oc should

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20- For every 2 degrees of pantoscopic tilt, the OC should be:a. raised 0.5 mm above the pupil center.b. raised 1 mm abovethe pupil center.c. lowered 0.5 mm below the pupil center.d. lowered 1 mm belowthe pupil center
21-You measure an MRP height to be 26 mm. The B dimension of theframe is 44 mm and the pantoscopic tilt of the frame is 12 degrees. Howhigh should you order the MRP.e.
22-A distometer is used to:
23-For every one diopter increase in base curve, what happens to thevertex distance?
24-In measuring for a trifocal, we find the distance from the inside bevelof the lower eye wire to the lower edge of the pupil to be 22 mm. Whattrifocal height should be ordered?a. 22.5 mmb. 23.5 mmc. 24 mmd. 21 mm
25-How should bifocal height be positioned for a child?
26-A frame has the dimensions of 4919 with an ED of 52 mm. The
patient’s PD is 68 mm. What is the minimum lens blank size required?
27-What is the smallest lens blank size possible for a 50 mm round eyesize frame if the lens must be decentered 3 mm per lens?
28-A conventional crossed-line-target lensometer is being used to findthe power of a lens. To measure the prescription in plus cylinder form,begin by turning the power wheel:a. In the high plus direction.b. In the high minus directionc. Ineither direction.
29-When a lens is measured in the normal manner, with the back side ofthe lens against the lensometer stop, the power being measured iscalled:

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Term
Spring
Professor
Naveed Babur
Tags
c, Corrective lens, lens shape

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