I’m guessing that you have a cut out issue. Try decentering the blank upward to eliminate the ED cut out issue and also grind the optics that same amount.
Chris
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I’m guessing that you have a cut out issue. Try decentering the blank upward to eliminate the ED cut out issue and also grind the optics that same amount.
Chris
A valuable tool is the Younger Gauge Master. Great for aligning axis and vertex depth of the reticle. I see them on eBay from time to time. Or take a lens of good power and spot the OC rotate the...
It might be helpful to know if the lenses are plus, minus or plano. And is this a near or distant issue (both) Presbyopia?
Chris
There is a magnet behind that door. Try adjusting it outward about 1 mm. If that doesn’t work, try replacing it.
Chris
There are some good wood working videos that show a shop vac with a cyclone mounted vertically. Combined with a filter bag and heapa filter your air quality will be good. One thing I would do is port...
A little history (because I’m old) … Back in the seventies we had one charge if we could fill an SV Rx with stock lens and another if we had to surface. Spheres were less expensive, and cylinders...
This formula is incomplete as it’s not considering lens final size. Also, percentages often misled.
WINDEX® for a clear windshield. Your car's plastics gives off fumes that accumulate on glass surfaces. Also clean your glasses.
I think we are talking about two different things. The pupils didn’t move but the FPD did change so the inset must be recalculated for horizontal movement. Vertically the B measurement did not change...
Excellent little ditty from Younger. Its copy righted.
https://www.camberlens.com/the_truth_about_base_curve.aspx?langId=1
Labs try to choose a front curve that necessitates an inside base curve of around -6.00. Any add only reduces the integer by that plus amount. Using a -1.00 inside curve with a ff pal … well you...
Sounds like a very good idea! Better yet is to get a tracer. Glaze came from widow replacement conscripted by us.
Kind of a baited question. There are dozens of ophthalmic materials out there all having different properties, purpose, and functions. All these lenses are affected by the type of hard coats factory...
Resultant Prism for Near PD for Optical Purist
I remember doing this once in school from a tutorial, in a B&L Job Coach. Distant power in the 180 times inset /10= Error. Use Prentice prism rule to...
Caused by high index lenses with scratch resistant coating of a much low index of refraction. Move it out of florescent lighting and this goes away, even so it is imperceptible from the wearer’s...
Upside down flat top. Cement on round seg. Fresnel stick on power, SV distant with addition pair readers, smart phone and increase the font or just cheat at the 19th hole.
Look at your joy stick settings. This controls your "X and Y axis" Also if I rember this this won't work past windows 5???? Good luck
Chris
Lensometers are made to measure power on the concave side lenses. Your double aspheric might be changing the vertex depth expected by the machine as well as a small aspheric design measured in the 7...
my bad I meant lower index
Between Cr-39™ and 1.67 we are only talking 3/10 mm difference thickness. Dump the drilled rimless whare the lab has adopted the strap thickness for tensile strength and use a metal or Zyl {age}...
https://www.dactechnologies.com/
If I remember correctly there are screws under the rubber pads
I would contact the mfg. and its about hours of service and a component of time
A lensometer can measure toric surfaces in mid indexes well but fails to measure high indexes with prism values over 3 diopters. I do think that labs should provide atoric and progressive maps of...
Seems a little unfair to compare a Cr-39™ spherical lens to a 1.76 aspheric lens in an uncut form. Take a -5.00 sph in a 48 mm frame and 1.74 and 1.6 indexes you can reduce edge thickness 0.5 mm. Not...