Prism Study

Question 1

. A tropia

Answer 1

A constant eye turn

Question 2

A phoria

Answer 2

A tendency for the eye to turn when tired or stressed

Question 3

Eso

Answer 3

Inwards turn / base out

Question 4

Exo

Answer 4

Outwards turn / base in

Question 5

Hyper

Answer 5

Upwards turn / base down

Question 6

Hypo

Answer 6

Downwards turn/ base up

Question 7

d = (n-1) a

Answer 7

angle of deviation

Question 8

Centrads

Answer 8

A deviation of one unit of arc at a distance of 100 units from
the prism

Question 9

Where does the light refract?

Answer 9

Towards the base of the prism

Question 10

What type of lens converges light?

Answer 10

A plus lens

Question 11

What type of lens diverges light?

Answer 11

A minus lens

Question 12

P = cF

Answer 12

How much prism is induced in the lens

Question 13

DPE - If my eyes can comfortably do it?

Answer 13

Subtract the prism to get the total DPE

Question 14

Resultant = √vertical2 + horizontal2

Answer 14

Combined oblique prism, can’t combine 2 different type of prism together

Question 15

tan0 = opp / ada

Answer 15

To work out the angle of oblique prism after using resultant / vertical / horizontal