mono pd's using pupilometer
I see quite a few mono p.d's that are 5 to 6 mm difference, like 28 / 34 sent to our lab. Back when I used to take mono p.d's the old fashioned way with p.d. rule.
1st measuring binocular, then from center of bridge to right pupil and then from center of bridge to left pupil, it wasn't perfect, but with double checking by marking the demo lenses it usually worked out well.
I just don't remember p.d's being up to 6mm difference as often as I see it nowadays.
Thoughts?
Re: mono pd's using pupilometer
Quote:
Rich R said:
I see quite a few mono p.d's that are 5 to 6 mm difference, like 28 / 34 sent to our lab. Back when I used to take mono p.d's the old fashioned way with p.d. rule.
Thoughts?
Sorry I'm so late on this thread.
A pupillometer is accurate. However I wouldn't have one in my practice, it's just too clinical.
I've learned the hard way about mono pds over the last 32 years of fitting PALS.
Before I even start taking a PD, I chat to the Px both in a standing position and then I ask him/her to sit and carry on the chat.
I'm not interested in the chat, this is just a carrier to see how the person holds his head, is there a natural tilt? Is he more comfortable with his head to the left (or right)
In the sitting position I then take a full PD, adjust the frame to the face, and approximately 'dot-up' the demo lenses to the pupil.
From then on it's just a matter of adjusting the dots to the comfortable position of the pupils and getting the Px to walk with the dotted frame and observe him.
Of course you have also to take into account his life style and what he wants the glasses to do for him.
Sorry it's a bit long winded, but the end of the story is that sometimes I come out with Mono PDs of Rt 28 Lt 34 and the pupillometer will tell me its 31/31
I can assure you the Px is happier with 28/34