Contact Lens Materials - (Learn By MCQ) Part-1

#optometry #Presbyopia #OptometryMCQ #EyeMCQ #Eye #smartoptometry #ChandigarhUniversity #OptometryStudents #EyeQuiz
1. How many types of contact lens are there based on material?
a.3
b.4
c.5
d.6
2. Which is the right material for rigid non gas permeable lens?
A. CAB
B. HEME
C. PMMA
D. Silicon
3. Which materials is used to make the RGP lenses?
a. PMMA
b. HEME
c. CAB , silicone , styrene
d. Copolymerization of PMMA
4. Soft contact lense are made up of?
a. PMMA
b. HEME
c. CAB
d. copolymerization of CAB
5. Which is wrong statement belongs to rigid non gas permeable lenses?
a. Impermeable to oxygen
b. Have higher DK value
c. Being hard , cause corneal abrasions
d. It is obsolete now
6. Which RGP material has highest DK value?
a. Silicon acrylate
b. CAB
c. Fluoropolymer
d. Styrene
7. Hydrogels are commonly used in
a. Hard contact lenses
b. Soft contact lenses
c. RGP contact lenses
d. None of the above
8. A pair of soft contact lens has hydration of 38% - 45%, the lenses are …
a. Low hydrated lens
b. High hydrated lens
c. Medium hydrated lens
d. None of the above
9. Degree of swelling of hydrophilic contact lens es in a given aqueous solution is depends on…
a. Temperature on the solution
b. pH of the solution
c. It is independent
d. Both a and b
10. What are the changes take place in a hydrophilic contact lens when water content is increase?
a. Diameter of pole increase
b. Gas permeable increase
c. No changes take place
d. Both a and b
11. Pick the disadvantage of high water lens es.
a. Decrease thickness of lens
b. High oxygen delivery to cornea
c. Increase access of cornea to atmosphere
d. Presence of small pores
12. Why silicone hydrogel lenses are better than regular hydrogel contact lenses
a. Allows 5 times more oxygen than regular hydrogel
b. Well for extent wear
c. Keep eye moisture and comfortable
d. All of the above
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Hai sir which one safe metirial base or coat base eye lens?

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Why high water content of soft contact lens have low refractive index ...

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Sister neenka optometrist daa