Extra Questions for Module 10
          Evaluation of Rx
Each worksheet is different, because each one was originally written by a different person.  Use the directions at the beginning of each worksheet for that worksheet.

Refractive errors

What is the refractive error for each of the following Rs's.  Use SMA, SHA, CMA, CHA, H, M.
 
 
1.  +3.50

2.  -1.00 -1.00 x180

3.  +0.50 -2.00 x030

4.  -1.00 +1.00 x080

5.  -1.00 +3.00 x110

6.  +8.75 -2.25 x005

7.  -16.75 -2.00 x179

8.  -16.75 +2.00 x005 

9.  -0.75 +1.00 x092

10.  -1.62 +1.75 x115

11.  +0.25 -0.50 x135

12.  pl -0.50 x058

13.  -4.25

14.  pl +3.75 x053

15.  +0.25 -0.50 x145

16.  +0.25 -0.25 x135

17.  +22.50 -3.50 x058

18.  -0.25 -0.50 x033

19.  +1.00 -2.00 x090

Refractive Error Study Sheet

1.  What are the two major causes of myopia?

a.  How do we correct for myopia?
b.  What are the symptoms of myopia?
c.  What is another term for myopia?  Why is it called that?
2.  What are the two major causes of hyperopia?
a.  How do we correct for hyperopia?
b.  What are the symptoms of hyperopia?
c.  What is another term for hyperopia?  Why is it called that?
3.  What is the cause of presbyopia?
a.  How do we correct for it?
b.  What are the symptoms of presbyopia?
4.  what do the following mean:
a.  OD
b.  OS
c.  OU
d.  Add
5.  What refractive error is corrected by the following Rs's:
a.  -5.00 sph
b.  +5.00
c.  pl, Add +3.50
d.  +2.00 -1.00 x090
e.  pl -2.50 x120
f.  -2.00 -2.00 x135
g.  +1.00 -1.00 x045
h.  +1.00 -2.00 x115

The answers are here.  Please do them yourself before you go to the answers.  If you understand it all and you don't need the practice then it will only take you a few minutes to do them.  If you are struggling with the formulas do one or two, check them, do a few more, check them, . . . just make sure that you do not look ahead of the ones that you did and are checking.

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