Keystone Telebinocular Visual skills

Question 1

what does the keystone telebinocular visual skills machine do

Answer 1

series of cards that screen for visual skills function - used as pretesting for acuity, binocular and color vision defects

Question 2

what are the lenses in the brewster stereoscope/septum

Answer 2

+5D lenses that are 95mm apart

Question 3

what is on the simultaneous perception card

Answer 3

a dog and pig

Question 4

how are vertical phorias tested

Answer 4

horizontal yellow line and red symbols - ask patient where the yellow line is going through the red symbols

Question 5

how is fusion at distance tested

Answer 5

2 white dots with black lines in center and a red and blue dot (3 dots= fusion, 4= over/under convergence)

Question 6

How are lateral phorias tested

Answer 6

with modified throrington: arrow and numbers (tests phoria and stability) -> record the first number they see with the arrow

Question 7

how is visual acuity in the distance tested

Answer 7

monocular VA in a binocular field

Question 8

what does the patient have if they have improvement in VA if one eye is occluded

Answer 8

suppression under binocular conditions

Question 9

what can #10 on the VA indicate if answered correctly

Answer 9

hyperopia (20/15)

Question 10

what VA do you record

Answer 10

the last correct response before 2 successive failures

Question 11

how many sec of arc does row 1 have

Answer 11

1.103

Question 12

how many sec of arc does row 12 have

Answer 12

82.5

Question 13

what do you do after the patient finishes the color card for distance

Answer 13

move the card holder to test lateral phoria and fusion at near