- 1. The ability of a contact lens material to align the ocular surface and not deform under tension.
- A) Elasticity.
- B) Rigidity.
- C) Wettability.
- D) Ionicity.
- 2. The ability of a contact lens to withstand deforming forces is called?
- A) Elasticity.
- B) Rigidity.
- C) Wettability.
- D) Ionicity.
- 3. The biological response of Contact Lens material to its environment is called?
- A) Elasticity.
- B) Rigidity.
- C) Bio-Availability.
- D) Ionicity.
- 4. The percentage of the contact lens that is constituted by water is called?
- A) Elasticity of CL.
- B) Rigidity of CL.
- C) Water Content of CL.
- D) Ionicity of CL.
- 5. What does a large contact angle measurement indicate in the Sessile drop method?
- A) The material is completely wettable.
- B) The material is somewhere wettable.
- C) The material is poorly wettable.
- D) The material is highly elastic.
- 6. What is the formula used to measure oxygen transmissibility of a contact lens?
- a) Dk/p.
- b) Dk/t.
- c) Dk/u.
- d) Dk/r.
- 7. What is the range of water content in contact lenses, considered as high-water content?
- a) 20-40% .
- b) 41-60% .
- c) More than 60% .
- d) Less than 20%
- 8. The ability of a contact lens to transfer oxygen to the cornea is called?
- A. Oxygen Transmissibility (Dk/t).
- B. Oxygen Permeability (Dk) .
- C. Both A & B.
- D. None of These .
- 9. What is a material with a Dk value below 20 considered as?
- a) Low oxygen permeable material .
- b) Mild oxygen permeable material .
- c) High oxygen permeable material .
- d) Hyper Dk material .
- 10. What can happen if there is lower oxygen transmission to the cornea?
- a) Microcysts.
- b) Change in corneal pH level.
- c) Edema.
- d) All of the above.
- 11. The net charge on the contact lens material’s surface is called?
- A) Elasticity.
- B) Rigidity.
- C) Wettability.
- D) Ionicity.
- 12. What is an ideal tonicity for a contact lens solution?
- a) Hypertonic.
- b) Hypotonic.
- c) Isotonic.
- d) Variable.
- 13. What happens to the water content of a contact lens with an increase in rigidity?
- a) It increases.
- b) It decreases.
- c) It remains the same.
- d) It is not affected by rigidity.
- 14. What happens to rigidity with an increase in thickness of the contact lens?
- a) It decreases.
- b) It remains the same.
- c) It increases.
- d) It is not affected by thickness.
- 15. Which type of material has negative poles on the outer surface?
- a) Ionic material.
- b) Non-ionic material.
- c) Both ionic and non-ionic materials.
- d) None of the above.
- 16. Which type of material has less chance for deposits of charged particles and debris?
- a) Ionic material.
- b) Non-ionic material.
- c) Both ionic and non-ionic materials.
- d) None of the above.
- 17. What is the advantage of low water content contact lenses?
- a) Higher oxygen permeability.
- b) Less rigid.
- c) More susceptible to pH.
- d) None of these.
- 18. What is considered low water content for a contact lens?
- a) Less than 20% .
- b) 20-40% .
- c) 41-60% .
- d) More than 60% .
- 19. What is the effect of tear proteins on non-ionic material?
- a) It enhances wettability.
- b) It has no effect on wettability.
- c) It reduces wettability.
- d) It increases deposits on the surface.
- 20. Higher the water content higher the Rigidity.
- A. True.
- B. False.
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