Presbyopia Flashcards
At 40 cm, “add” for 40-45 years old
+0.75 to +1.00 add
At 40 cm, “add” for 45-49 years old
+1.00 to +1.50
At 40 cm, “add” for 50-54 years old
+1.50 to +2.00
At 40 cm, “add” for 55-59 years old
+2.00 to +2.25
At 40 cm, “add” for 60-65 years old
+2.25 to +2.50
At 40 cm, “add” for over 65 years old
+2.50 or greater for mag
A person with cataract surgery needs an “add”, what power do you give them? Why?
+2.50
They can’t accommodate fir the stimulus at 40 cm.
2 most important things when determining add for presbyopes
1) Occupational demands
2) Near working distances
True or False:
“Never cut the total near plus on a presbyope”
True
True or False:
FCC usually works better for older or more established presbyopes.
True
Purpose of NRA/PRA Balance (Middle third method)
Puts the patients accommodation in the middle of the PRA/NRA range, with the nets being equal.
What is the minimum plus method to 20/20 to find the patient’s near lens?
Add plus lenses until they can just barely read the 20/20 line. Then give them an extra +0.50D for good measure.
What does FCC test measure for presbyopes?
Add power
Why might a presbyope not report the vertical lines as darker when doing the FCC test?
You may not have blurred them enough. Older patients may need close to 2.50D of blur instead of 1.25D (5 clicks)
If you do near retinoscopy at 67 cm, what must you add or subtract to find their prescription at near?
Since retinoscopy is -1.50D working distance and their accommodation at 40 cm is +2.50, it would result in them needing 1.00D of accommodation
SO….
Add +1.00D on their retinoscope rx.
If a presbyope has been using a +3.00D add and you retest their manifest, run the FCC, and get their add to be +2.00D, what do you prescribe them?
You give them a +3.00D add because you never cut plus on a presbyope unless they complain of holding object too close.
If a patient has a lower add, they will have a _______ range where they can see clearly at near.
larger
If a patient has a high add, they will have a _______ range where they can see clearly at near.
shorter
With a patients near ranges, if they can read closer in more easily than further out, the add is too much _____.
plus
With a patients near ranges, if they can read further out more easily than closer in, the add is too much _____.
minus
