PD and Frame Size

[ksquared]

If you were trying to find a frame that would minimize the edge thickness of the lens for a person with high myopia could/would you use the persons PD?

Example: PD = 61, look for a frame with the markings = 44 (eye size) / 18 (bridge).

[For-Life]

Yes I would consider the PD; however, in a general case a smaller frame would have thinner lenses. In that case your PD would be 61 and the frame PD would be 62, so your centration of the lenses would be very close to the centration of the frame. In that case that is a good frame choice as the lenses would come out very thin.

[harry a saake]

minimizing edge thickness is a combination of af few factors, number one being the frame pd matched to the patient PD, number two is to use the thinnest lens made in whatever that may be, which might depend on lens type, sv, bifocal, etc. Number three is the actual shape of the frame itself. If you were to take two frames one round and one aviator shaped and both frames had the same PD, the avaitor would result in a thicker edge because of the longer measurement diagonally.

[UFRich]

Pt pd, frame size, and frame ed, as well as material used will create a thinner lens. Small frames with sweeping or bowed temples help with larger heads.

[EyeManFla]

Patient PD and Frame PD are most important. In a high minus Rx, I generally don't like to decenter more than a total of 4-5mm.


Even in a 1.67 lens, if the Patient PD is 60, but the Frame PD is 80, you are still going to have a patient complaining about thick edges.

The bowing temple idea is a sound one. I carry quite a few of these and even on bigger guys, they will still work well.

[ksquared]

Thanks for all the info.

"Time flies like an arrow. Fruit flies like a banana..."