NCLE Basic Contact Lens Design Exam If the CPC of a rigid contact lens is held constant while the diameter is increased, it would result in: A. a tighter
... [Show More] fit B. a looser fit C. less vaulting D. increased gas permeability When compared with PMMA, CAB lenses: A. have much better gas permeability B. can be fit larger C. are less likely to result in hypoxia induced corneal edema D. all the above When compared with PMMA which of the following is NOT true about CAB lenses? A. they have excellent shape retention B. they can be fit tighter C. they can be fit larger D. they are better for sports HEMA is an abbreviation commonly used to describe: A. rigid lenses B. gas permeable lenses C. soft lenses D. corneal abrasion The chief reason to utilize a ballasted contact lens is: A. to correct vertical prismatic imbalance B. to lower the wetting angle C. to inhibit lens rotation D. to tighten the fit Which of the following is NOT true of PMMA lenses? A. spherical lenses can generally correct for up to 3.00 diopters of corneal astigmatism B. they are easily fabricated C. they have a long history of acceptance D. they have excellent gas permeability Which of the following is NOT true about soft contact lenses? A. spectacle blur is uncommon B. there is less flare and photophobia than with "conventional" rigid lenses C. rapid adaptation to lens wear is possible D. spherical lenses will correct for moderate to high amounts of corneal astigmatism The central portion of the back surface of the contact lens is called: A. the central posterior curve (CPC) B. the primary base curve C. the base curve D. all of the above The distance between a flat surface and the back surface of the central portion of a lens is the: A. chord diameter B. sagittal depth C. principal meridian D. back surface power A contact lens design which utilizes a lenticular bowl is typically employed with: A. bitoric lenses B. prism ballasted lenses C. higher minus lenses D. higher plus lenses A loose fitting contact lens can be made to fit tighter [Show Less]