MCQs in Optometry- I

VISION CLUB

1. Fluorophotometry is an useful measure of

          a)     the pattern of sodium fluorescein in RGP fitting

          b)    the expulsion of post-lens tear volume in Silicone hydrogels

         c)     tear exchange in hydrogel soft lenses

         d)    movement of debris and metabolites in pre-corneal tear film

2. According to Holden and Mertz criteria, hydrogel lens with the critical oxygen transmissibility of 87.0 ± 3.3 x 1-9 (cm x ml O2) /(sec X ml x mmHG) may create the edema of……..on overnight wear

         a)    4%

        b)    8%

       c)     9.9%

       d)    12.1%

3.  In a typical commercial PAL, a progressive corridor is given by

        a)     length from the distance circle to the near circle

        b)    length from the prism reference point to near add circle

        c)     length from the fitting cross to near add circle

        d)    length from fitting cross to the point with 85% of near add

         4. A point in the horizontal line 3.0mm away from the umbilics of a progressive lens has a 6 diopters of astigmatism. What is its rate of change in the spherical add power per mm?

a)  0.5

b)    1

c)     1.8

d)    2

5. A bifocal has following parameters: segment depth: 4.5mm, segment drop 1.5mm, segment width 6.5mm segment inset 2mm. What is your expected segment height for this bifocal lens?

a)     2mm

b)    4mm

c)     6mm

d)    8mm

6. In the brown tinting of an ophthalmic lens, which element is most likely to be used?

a)     Uranium

b)    Sulphur

c)     Nickel

d)    Cerium

7. In subtractive color system, the three primary colors are

         a)     Red, green, yellow

        b)    Cyan, Magenta, yellow

        c)     Red, green, blue

       d)    Cyan, magenta, green

            8. One is false about bifocals

a)     In flat-top bifocals the segment optical center is generally 5 mm below the top

b)    Blended bifocals and fused bifocals terms can be used interchangeably.

c)     Ribbon-segments are available only in glass

d)    If the major reference point falls farther than 2 mm outward from the geometrical center, the total inset will be out.

9. Geneva lens measure works closely on the principle of

a)     Lens guage regression formula

b)    Vector law of Radiuscope

c)     spherometer and lensometer

d)    Sagittal depth formula

10. A CR-39 prism shifts an object by 8 degrees. The apical angle of this prism should approximate:

a) 2 degrees

b) 4 degrees

c) 12 degrees

d) 16 degrees

11. Find out the correct tube length of a Galiliean telescope whose objective and eyepiece are of forty and twenty diopters respectively.

a)     2cm

b)    2.5cm

c)     6.5 cm

d)    7.5 cm

12. The ophthalmic lenses did have inbuilt UV protective properties, which contact lenses did not. Later to incorporate these properties in contact lens a chemical additive was added, the name of which is

a)     Chromatin

b)    Chromosphere

c)     Chromophore

d)    Chromium 

13. The ghost images seen in high power spectacles are the product of

a)    Internal reflection

b)    Spherical aberration

c)     Prismatic effect

d)    Jack-in-the-box phenomenon

14. A patient is advised to have a variable vertex distances for reading, intermediate and distance viewing. Which feature of frame would you think suite her?

a)     Comfort cable

b)    Skull temple

c)     Library temple

d)    Clip-on frame

15.Corneal epithelium consists 3 layers of cells. Exclude the one which does not fall in those layers:

a) Goblet cells

b) Superficial cells

c)  Wing cells

d) Basal cells

16. These lenses incorporate a reading or near segment located eccentrically. These lens move on the cornea in such a way that the wearer views distance and near through the appropriate segment at the appropriate time. To be effective, the contact lens must translate upwards on the cornea when eyes look down to view near objects. As the design is rotationally asymmetric, lens must remain correctly at all times. All points make a case for

a)     Concentric design contact lenses

b)    Diffractive design contact lenses

c)     Aspheric design contact lenses

d)    Alternating vision contact lenses

17. One of the following is true

a)     Lens flexure will induce a plus cylinder whose axis is aligned with flattest corneal meridian

b)    Lens flexure will induce a minus cylinder whose axis is aligned with flattest corneal meridian

c)     Lens flexure will induce a plus cylinder whose axis is aligned with steepest corneal meridian

d)    Lens flexure will induce a minus cylinder whose axis is aligned with steepest corneal meridian

Ans: 1b 2a 3d 4b 5d 6c 7b 8b 9d 10d 11b 12c 13a 14c 15a 16d 17a

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