NCLE Chapter 9
1. A spin cast lens will generate:
2. a) an aspheric back surface b) a spherical back surface c) a toric back surface d) all of
the above - ANS-a
3. After reducing the overall diameter, which of the following additional modifications are
required?
4. a) applying peripheral curves b) blending
5. c) edge shaping and polishing d) all of the above - ANS-d
6. After the sharp junctures between curves on the lens posterior are smoothed out, they
are called:
7. a) blends c) lenticulation b) bevels d) apex - ANS-a
8. An in-office modification that can be done to thin the edge of a minus lens is the:
9. a) hyperflange b) myoflange
10. c) CN bevel d) ski edge - ANS-c
11. Buttons and raw materials used in hydrogel lens manufacturing are tested and
quarantined:
12. a) to ensure that they comply with approved standards
13. b) to ensure that they meet approved specifications c) before they can be used in
production
14. d) all of the above - ANS-d
15. Calculation of which lens parameter is NOT under the control of the fitter?
16. a) central posterior curve
17. b) posterior optical zone
18. c) anterior power curve
19. d) center thickness - ANS-a
20. During the lathe cutting process, humidity must be controlled at a low level in order to:
21. a) avoid premature hydration
22. b) maintain quality standards
23. c) avoid destruction of the lens
24. d) all of the above - ANS-d
25. During the lathing process for toric lenses, cylinder power is generated by:
26. a) using a cylindrical diamond cutting tool
27. b) blocking the lens off center
28. c) squeezing the lens in a crimping tool
29. d) truncating the lens - ANS-c
30. Hydrogel lens materials allow the transport of oxygen to the cornea and carbon dioxide
away from the cornea because they contain:
31. a) acrylic polymer chains
32. b) water bound to reactive sites
33. c) three dimensional polymers
1. A spin cast lens will generate:
2. a) an aspheric back surface b) a spherical back surface c) a toric back surface d) all of
the above - ANS-a
3. After reducing the overall diameter, which of the following additional modifications are
required?
4. a) applying peripheral curves b) blending
5. c) edge shaping and polishing d) all of the above - ANS-d
6. After the sharp junctures between curves on the lens posterior are smoothed out, they
are called:
7. a) blends c) lenticulation b) bevels d) apex - ANS-a
8. An in-office modification that can be done to thin the edge of a minus lens is the:
9. a) hyperflange b) myoflange
10. c) CN bevel d) ski edge - ANS-c
11. Buttons and raw materials used in hydrogel lens manufacturing are tested and
quarantined:
12. a) to ensure that they comply with approved standards
13. b) to ensure that they meet approved specifications c) before they can be used in
production
14. d) all of the above - ANS-d
15. Calculation of which lens parameter is NOT under the control of the fitter?
16. a) central posterior curve
17. b) posterior optical zone
18. c) anterior power curve
19. d) center thickness - ANS-a
20. During the lathe cutting process, humidity must be controlled at a low level in order to:
21. a) avoid premature hydration
22. b) maintain quality standards
23. c) avoid destruction of the lens
24. d) all of the above - ANS-d
25. During the lathing process for toric lenses, cylinder power is generated by:
26. a) using a cylindrical diamond cutting tool
27. b) blocking the lens off center
28. c) squeezing the lens in a crimping tool
29. d) truncating the lens - ANS-c
30. Hydrogel lens materials allow the transport of oxygen to the cornea and carbon dioxide
away from the cornea because they contain:
31. a) acrylic polymer chains
32. b) water bound to reactive sites
33. c) three dimensional polymers
