A patient presents a prescription reading OD -2.00 -1.50 x 180. What is the spherical equivalent of this lens?
Ophthalmic Optics
Question · Medium
Where the eye fluid flows
Short
How is a prescription transposed?
Flashcard
What does the 'axis' value in a spectacle prescription indicate?
Question · Easy
Lens component, measured in diopters, that redirects light so a person with double vision sees one image.
Ophthalmic optics
Guess the Term
Chapter 1: Ophthalmic Optics Terminology & Prescriptions
1.1 Ophthalmic Optics Terminology
Study guide
Cheat sheet
Which lens material has the highest index of refraction among common ophthalmic materials?
Read the clue and guess the term in 6 tries.
Game
What does a plus-powered spectacle lens do to parallel light?
A lens with a power of +4.00 D has a focal length of:
Prescription value, in diopters, whose minus sign means nearsightedness and whose plus sign means farsightedness.
Transposing the prescription +2.00 -3.00 x 090 yields:
Question · Hard
What does a minus-powered spectacle lens do to parallel light?
What is the Abbe value of polycarbonate lens material?
Number from 0 to 180 degrees that tells where on the cornea a person's astigmatism is located.
1.2 Prescription Interpretation & Transposition
A patient looks 8 mm below the optical center of a +3.00 D lens. Using Prentice's Rule, how much prism is induced?
Swap tiles to line up three of the same term.
Term Match
What does cylinder axis identify?
Which type of multifocal lens provides a gradual change in power from distance to near with no visible line?
___ curve: the single front surface of a lens, measured in diopters over its distance portion.
What is the primary advantage of Trivex lens material over polycarbonate?
What is spherical equivalent?
The add power in a bifocal prescription refers to:
Prescription value that measures how much astigmatism a person has.
1.3 Measurement Systems & Conversions
Which measurement refers to the distance from the back surface of the spectacle lens to the front of the cornea?
Dispensing Procedures
Flip two cards at a time to find matching terms.
Term Pairs
What does Prentice's rule calculate?
What is the standard vertex distance assumed in most spectacle prescriptions?
Refractive error that makes far-away objects look blurry because light focuses in front of the retina.
Ocular anatomy and refraction
When measuring monocular pupillary distance (PD), you should measure from:
Where is prescribed prism power located in a lens?
A patient's binocular PD is 64 mm. If the frame has an eye size of 52 mm and a bridge size of 18 mm, what is the total decentration per lens?
Light-sensitive layer at the back of the eye that turns light into electrical signals.
Chapter 2: Lens Characteristics & Calculations
2.1 Lens Characteristics & Powers
What does ANSI Z87.1 establish standards for?
Laws Regulations Standards
Find five hidden terms in a grid of letters.
Term Search
What does a higher refractive index generally allow?
Safety lenses marked with a '+' symbol on the lens indicate they have passed which test?
Color added to a lens that does not by itself show how much ultraviolet light the lens blocks.
Ophthalmic products
Which federal regulation requires that all ophthalmic lenses sold in the United States meet minimum impact resistance standards?
What does Abbe value describe?
A lensometer (focimeter) is primarily used to:
Instrumentation
Loading more…