What tool is used to make eyeglass prescriptions?

Question

I'd like to know the name of the tool with all of the lenses and k***s that an Ophthalmologists uses to get someone's eyeglass prescription? Thanks.

For those that want to know why.. I plan to obtain one and learn how to operate it so that I may provide prescriptions in the event of a general breakdown of society.

Answer 1

Its a phoroptor,  see the photos

http://www.lakelandweb.net/floridaeye/pr...

Answer 2

An eyeglass prescription is a written order by an optometrist or ophthalmologist to an optician for eyeglasses. It specifies the refractive power to which the eyeglasses are to be made in order to correct blurred vision due to refractive errors, including myopia, hyperopia, astigmatism, and presbyopia. It is typically determined using a phoropter or an automated refractor.

Answer 3

Alex,

the "tool" as you call it is called a Refractor.  There are over 100,000 combination of lenses inside it.  Without knowing how to measure for prescriptions and what each means, you would spend a lifetime of trial and error finding someone's prescription.

Why not take 8 years, go to school and learn how to do it to save society and provide medical care.