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A few Questions and my answers, am i right?


The Following RX is to be made in Bifocal form:

R -5.00DS/-1.00DCx180
L -2.00DS/-1.00DCx180 ADD +2.50

What is the differential vertical...

And you would be right!
**Edit - I work in a comprehensive RX house, dont do anything with frames, but give me a average RX and i can produce the lenses with Tint/SR/AR for mineral and plastics!
...

Hi there, may remember me from last year, final optical technician exams are in 2 weeks!!
So i have a favour to ask all you generous people.
If yous dont mind may i pop what ever questions i come...

I was just reading up about this in my course and i will quote it.

"In cases where two lenses in a given prescription require different base curves owing to differing powers it is usual to match...

This is what annoys me about distance learning couses. I work in a RX house concetrating on surfacing, Hardcoating, and AR coating mineral and plastics lenses. No where in the course does it explain...

Just ordered myself a copy from amazon.com. $51 new

Thanks very much

Hi all,

Got a question, looked over my notes and i cant seem to find an example question to follow.

1. Given a ring tool cutter with a diamter of 50mm and a cutting head diamater of 8mm. If...

Thanks for all the help guys!

I will post what the instructor says when he returns my homework in a weeks time!

Hello all,

well some of yous might remember me from last year and my endevours to pass First year of a long distance learning course to become a optical technician. Well i passed somehow! and...

well double checked and so emailed the course provider, so will see if they get back in touch with me.


Any help available for B and C?

the actual transposing of the Rx to toric form given a base curve or a sphere curve i can do, i know the steps easy as pie. Its just if i went wrong on the 2 questions in (A) then i just cant figure...

Thanks HarryChilling!!

ok doing some revision, exams next month :eek:

(A)
I cant seem to get the same answers as my course notes for 2 questions out of 20.


Transpose the following...

what kind of scratches are on the lenses?

Are we talking scratches from clipping the lenses into the pannier, handling scratches or circular scratches due to maybe contaminated deblocking rings?...

r = (1.654 -1)1000
--------------
10.50


r = 62.29mm

r * 2 = 124.58mm

1. A lens measure is placed on a copper tube and is then rotated untill its legs are at right angles to the axis of the tube. The reading given by the instrument reads +10.50. What is the external...

I am doing a distance leaning optical technicians course and i am having some problems fully understanding the whole issue of the direction of base when figuring out prisms and decentration.

1) ...

Thanks everyone, i took a couple of days off work and sat myself down and done a good bit of work and i am feeling much better for it. Dioptre is how we spell it here by the way :D

Question was...

Good Afternoon, i am currently studing to become a optical technician by mail and i was wondering if yous could help me answer a question.

A lens has a focal length in one meridian of +25cm and...