Equations

Question 1

Refractive index

Answer 1

n=c/v where n is the refractive index, c is the speed of light in a vacuum, and v is the speed of light in a substance

Question 2

snells law

Answer 2

n1sinø1=n2sinø2

Question 3

Goldmann Equation

Answer 3

Pressue=(rate of aqueous formation/outflow facility) + episcleral venous pressure

Question 4

Prentice’s Rule

Answer 4

PD deviation=Hcm X P; where Hcm is height in cm deviation from optical center of glasses and P is the dioptric power of the glasses. Prentice law is that a lens will have a prismatic effect the further you get away from the optical center

Question 5

Estimated formula for determining effect of glasses on strabismic patient

Answer 5

2. 5 X P (of glasses) = % change to measure deviation. If myopic then measures more, if hyperopic then measures less
   e. g. 40 PD deviation with -10 glasses=25% change. Since myope add this to the deviation= 10 +40 so a measured deviation of 50PD

Question 6

How many millimeters below the optical center of the distance portion of the lens is the bifocal segment usually added?

Answer 6

2mm

Question 7

VERMIN

Answer 7

Negative lens (concave) always produce an image that is:

Virtual
Erect
Minified