CPOA questions with correct answers

how long should the tear film remain uniform over the cornea after a normal blink( tear break-up time)? CORRECT ANSWER-10-15 seconds what is the normal reading for the Schirmer tear test? CORRECT ANSWER-15-20 mm in 5 sec lenses that contain 70% or more water are CORRECT ANSWER-high-water-content lenses surfactant cleaners for soft and rigid contact lenses contain soaps detergent to help remove _____? CORRECT ANSWER-oil, makeup, lipids the most common instrument used for measuring the base curve of a rigid contact lens is the CORRECT ANSWER-radiuscope patient who show _____ or more of corneal astigmatism as demonstrated by keratometry are good candidates for a special posterior lens design called toric. CORRECT ANSWER-2.50 D correcting one eye for distance and one eye for near is called CORRECT ANSWER-monovision recent studies have concluded that the relative risk of ulcerative keratitis with extended wear of disposable lenses is 4.5-7.0 time more likely than with_______. CORRECT ANSWER-conventional extended wear what is the area of the contact lens that corrects the Pt's