Chapter 5 Section 2 Answer questions a through c Central Eye Clinic advertises t
ID: 3153953 • Letter: C
Question
Chapter 5 Section 2
Answer questions a through c
Central Eye Clinic advertises that 90% of its patients approved for LASIK surgery to correct vision problems have successful surgeries. (a) In the random number table, assign the digits 0 through 8 to the event "successful surgery" and the digit 9 to the event "unsuccessful surgery." Does this assignment of digits simulate 90% successful outcomes? Yes No (b) Use the random digit assignment model of part (a) to simulate the outcomes of 15 trials. Begin at column 1, line 2. (Enter S for success and F for failure, separated by commas.) (c) Your friend assigned the digits 1 through 9 to the event "successful surgery" and the digit 0 to the event "unsuccessful surgery." Does this assignment of digits simulate 90% successful outcomes? Yes No Using this digit assignment, repeat part (b). (Enter S for success and F for failure, separated by commas.)Explanation / Answer
A) Yes
B) S,F,S,S,S,S,S,S,S,S,S,S,S,S,F
C) Yes. All 15 are S
If a patient was -6.0 diopters and after Lasik was -1.00 diopter, most surgeons and those in the industry would consider this a failure. The patient, however, may consider it a success because at age 50 she does not need to use reading glasses and still qualifies for a driver's license with 20/40 distance vision.. A patient who can make out the Snellen 20/20 line - familiar letters in black on a white background in a controlled lighting environment - may be considered by the doctor a success, but the patient does not have the crispness of vision experienced before Lasik and with glasses.
The nonprofit patient advocacy USAEyes.org took a different approach. Success of Lasik means that the patient received what was expected - no matter the numbers. Using a scale of Much Worse Than Expected, Worse Than Expected, As Expected, Better Than Expected, and Much Better Than Expected, the USAEyes Competence Opinion Reletave to Expectations (CORE) patient survey found:
99% report quality of life as expected, better, or much better
98% day vision as expected, better, or much better
98% no complications or issues are seldom problematic
98% would recommend surgery to family and friends.
97% would have surgery again, knowing what they know now
96% wear corrective lenses as often as expected, less, or much less than expected
96% report postop vision without lenses as expected, better, or much better than expected when compared to preop vision with lenses
96% report overall quality of vision as expected, better, or much better than expected
91% no complications at any time
91% night vision as expected, better, or much better
7% complications seldom problematic
– yet 91% of these same patients would have surgery again
2% complications frequent or always problematic
– yet 22% of f these same patients would have surgery again
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