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level: Level 1 of Lens

Questions and Answers List

level questions: Level 1 of Lens

Question	Answer
It is a transparent piece of glass or plastic with at least one curved surface	Lens
What is the latin term for a lens?	Lentil
A type of seed used in cooking	Lentil
Convex lens is also known as	Converging lens
Concave lens is also known as	Diverging lens
Positive lens	Convex lens
Negative lens	Concave lens
The convex lens is composed of infinite number of prisms positioned ____	Base to base
Concave lens is composed of infinite number of prisms positioned ____	Apex to apex
It is thicker across the middle and thinner at its edges	Converging lens
It is thinner across the middle and thicker at its edges	Diverging lens
In convex lens, two prisms placed _____ can bring two rays of light, originally parallel to a focus	Base to base
In concave lens, two prisms placed _____ refract light in a diverging manner	Apex to apex
It is suitable for patients with complex refractive errors including high spere, cylindrical power, special parameters, extreme powers, and extreme prisms	Specialty lenses
It helps address vision challenges for people with medical issues such as lazy eye, cataracts, and other rare eye conditions	Specialty lenses
Have single power or one range of vision	Single Vision lens
Most common type of prescription lens	Single Vision lens
Used for reading glasses to correct presbyopia (trouble focusing on objects at a close range	Single Vision lens
A bifocal lens	Double Vision lens
Created with two different areas of vision correction	Double Vision lens
The top portion of the double vision lens is used for _____	Distance
The bottom portion of the double vision lens is used for___	closer vision or near
Provide range of vision from distant to near, all without a line across the lens	Progressive lenses
Have multiple vision distances, including intermediate (for computer usage)	Progressive lenses
These are lenses which are designed to be suited in certain hobbies or jobs. Glasses that have these lenses are also known as special-purpose glasses or eyewear and they are not made for everyday wear.	Specialty lenses
It reduces glare and reflections from all light sources	Anti-reflection lenses
When exposed to light, the photochromic molecules in lenses begin to change structure absorbing more light and eventually darkening the lenses.	Photochromic lenses
It changes the orientation of the reflected waves of sunlight	Polarization
The horizontal waves absorb which reduces the glare	Polarized lenses
Blue light filter lenses is also known as	High Energy Visible (HEV)
Can penetrates deep into the eye, resulting damage to the retina (exposing the eye to hidden spikes intensity)	Blue light
It is the most commonly used material for eyeglasses	Polycarbonate lenses
Recommended for prescriptions ranging from: +/- 2.00 to +/- 4.00	Polycarbonate lenses