Light and Refraction Flashcards
Occurs when light passes from one medium to another of different refractive index
Refraction
Responsible for the majority of the refractive power of the eye
Cornea
What is the refractive power of the cornea
43-44D
A refractive component of the eye that has 20-23D refractive power
Crystalline lens
What is the total refractive power of the eye?
60-63D
This law states that light rays are focused on the retina because they are refracted by passing through the cornea and lens
Snell’s Law
Term for a normal eye
Emmetropia
Corneal refractive power is (constant, modifiable)
constant
Lens refractive power is (constant, modifiable)
modifiable
Axial length of the eye is (constant, modifiable) except under certain conditions
constant
A term when a refractive error is present
Ametropia
Nearsightedness
Myopia
Farsightedness
Hyperopia
Curvature of the cornea and/or lens is not spherical
Astigmatism
Term used when lens is not spherical
Toroidal
The loss of accommodative ability of the crystalline lens
Presbyopia
Presbyopia is more _____ in nature since it comes with advanced age
physiologic
Presbyopia is also called as?
Short-arm syndrome
A refractive power difference of more than 2D between the two eyes
Anisometropia
A difference of image size between the two eyes as perceived by the patient
Aniseikonia
Absence of lens
Aphakia
Phakos means?
Lens
Artificial lens in the eye
Pseudophakia
Lens with thin center and thick edges
Concave lenses
Made up of two prisms aligned apex to apex
Concave lens
Hallowed center
Concave lens
Lenses with thick center and thin edges
Convex lens
Bulging center
Convex lens
Made up of two prisms aligned base to base
Convex lens
Concave lenses create what type of images?
Virtual and erect
Minifies images
Concave lens
With movement
Concave lens
Convex lenses create what type of images?
Real and inverted
Magnifies images
Convex lens
Against movement
Convex lens
