Need a little help on

Zildjian242 · #1 11-30-2009, 01:42 PM

Hello all pretty cool sight, im currently in school for ophthalmic dispensing. I need a some help on determining the thickest point and the thinnest point on a lens when just giving a prescription. My notes on this is a mess

So how would i go about doing this say whats thickest point on a lens with a -2.50-1.25x90 percription?

Jacqui · #2 11-30-2009, 03:37 PM

it would be on the 180 line, thickness is dependent on lens size.

Fezz · #3 11-30-2009, 04:01 PM

The Power Cross is your friend!

It is also known as the Optical cross.

Here is astart!

http://www.opticianworks.com/chapter2.html

Fezz · #4 11-30-2009, 04:17 PM

http://www.nfos.org/degree/opt11/module_08b.html

Fezz · #5 11-30-2009, 04:19 PM

http://www.laramyk.com/education/opt...lens-form.html

Fezz · #6 11-30-2009, 04:23 PM

http://www.eyetec.net/group4/M16S2.htm

Fezz · #7 11-30-2009, 04:42 PM

I suggest a little - One-on-One with the instructor to clear this up.

hasyasasa · #8 12-01-2009, 03:32 AM

The Power Cross is your friend!

It is also known as the Optical cross.

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