Refraction Flashcards
What reading add is expected for a 40 year old?
+0.50D
What reading add is expected for a 45 year old?
+1.00D
What reading add is expected for a 50 year old?
+1.75D
What reading add is expected for a 55 year old?
+2.25D
At 55yrs what is changing the reading add and why?
Depth of focus, accommodation has ceased
What reading add is expected for a 65 year old?
+3.00D
What is the equivalent sphere for 6/5?
0DS
What is the equivalent sphere for 6/6?
0.50DS
What is the equivalent sphere for 6/9?
0.75DS
What is the equivalent sphere for 6/12?
1.00DS
What is the equivalent sphere for 6/18?
1.25DS
What is the equivalent sphere for 6/24?
1.75DS
What is the equivalent sphere for 6/36?
2.25DS
What is the equivalent cylinder with best vision sphere in place at 6/9?
1.25DC
What is the equivalent cylinder with best vision sphere in place at 6/12?
1.75DC
What is the equivalent cylinder with best vision sphere in place at 6/18?
2.25DC
What is the equivalent cylinder with best vision sphere in place at 6/24?
3.00DC
What is the equivalent cylinder with best vision sphere in place at 6/36?
4.00DC
What is the approx VA for a 2 year old?
6/12-6/9
What is the approx VA for a 3 year old?
6/9-6/6
What is the approx VA for a 5 year old?
6/6-6/5
What is the approximate Rx at birth?
+2.50DS
What is the approximate rx at 5-6yrs?
+0.75DS
What astigmatism is okay at brith?
1.00DC-1.50DC which reduces in the first couple of years
What anisometropia is okay in a 1-4yr old?
<1.00DS
When do you know you don’t need to cyclo?
-Good acuity, accommodation, stereopsis for age, no BV anomalies, no FH
With titmus stereo test what is a normal acuity for a 3.5yr old?
3000”
With titmus stereo test what is a normal acuity for a 5yr old?
140”
With titmus stereo test what is a normal acuity for a 6yr old?
80”
With titmus stereo test what is a normal acuity for a 7yr old?
60”
With titmus stereo test what is a normal acuity for a 9yr old?
40”
