For every 2 degrees of pantoscopic tilt the oc should

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 above
the pupil center.
c. lowered 0.5 mm below the pupil center. d. lowered 1 mm below
the pupil center
21-You measure an MRP height to be 26 mm. The B dimension of the
frame is 44 mm and the pantoscopic tilt of the frame is 12 degrees. How
high should you order the MRP .
e.
22-A distometer is used to:
23-For every one diopter increase in base curve, what happens to the
vertex distance?
24-In measuring for a trifocal, we find the distance from the inside bevel
of the lower eye wire to the lower edge of the pupil to be 22 mm. What
trifocal height should be ordered?
a. 22.5 mm b. 23.5 mm c. 24 mm d. 21 mm
25-How should bifocal height be positioned for a child?
26-A frame has the dimensions of 49 19 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 eye
size frame if the lens must be decentered 3 mm per lens?
28- A conventional crossed-line-target lensometer is being used to find
the 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 direction c. In
either direction.
29-When a lens is measured in the normal manner, with the back side of
the lens against the lensometer stop, the power being measured is
called: