Use of biometry in lens design

**eyemechs** · 02-17-2023, 12:17 AM

Hi OB,

I'd like to see what you all thought of the current tech of biometric scanning (Zeiss and Rodenstock) that goes into feeding lens design, specifically progressives. Rodenstock has the new Impressionist and Multigressiv range that handles the data from their eye scanner (an aberrometer, topographer, pupillometer, pachymeter, and tonometer) to map many many points in the eye as to minimise wavefront aberrations. I can't seem to find papers on it except where it relates to IOLs which is irrelevant.

Zeiss also has similar hardware but, according to a rep, didn't develop the software to translate the datapoints to meaningful parameters for lens design and manufacturing.

Is this some gobbledygook? Or is there legitimate basis here? I'm all for theory, but I've been burnt with over promises especially with the Varilux X range which had a higher fail rate than some old-time PPL designs.

**drk** · 02-17-2023, 07:29 AM

I'm skeptical.

Again, it's in danger of being a drop in a bucket. As a refractionist, I'm more worried about getting the quarter diopter of sphere and cyl correct than I am about a tenth of a diopter of coma or spherical aberration.

**Uilleann** · 02-17-2023, 02:28 PM

Originally Posted by drk

I'm skeptical.

Again, it's in danger of being a drop in a bucket. As a refractionist, I'm more worried about getting the quarter diopter of sphere and cyl correct than I am about a tenth of a diopter of coma or spherical aberration.

THIS. x1000

Remember that all those fancy biometric POW measurements get toosed out the window the second the frame isn't fitting perfectly either. Which neeeevvvveeeerrrr happens, I know. I'm just sayin - ya know? LOLZ