Distanve Visual Acuity

Question 1

what is the purpose of taking distance vision

Answer 1

to access how well the patient sees in the distance measured at 20ft

Question 2

describe test you would do if the patient is unable to see the Big E

Answer 2

move closer to chart if possible and record 15/400 if this is the distance the E is seen at. Count fingers. HM. LP with or without projection depending on the results. No light perception with indirect

Question 3

what test would you perform if the patient is unable to read letters or does not know their letters

Answer 3

’s, Illiterate E, HOTV, Allen Cards , always starting with the most accurate test , in the order they are listed above

Question 4

what would you do to check distance vision if patient has nystagmus

Answer 4

additionally check vision at null point ( in head position where nystagmus is the least) and if latent nystagmus is present ( only comes out when eye is covered) don’t occlude eye but instead blur the other eye with PLUS lens ( such as +5.00D or +3.00D) to prevent nystagmus

Question 5

what should you worn the patient not do to while checking their vision

Answer 5

no squinting no leaning forward

Question 6

why is it important to push the vision to the smallest possible letters that can be seen even if they are blurry

Answer 6

so vision can be compared from one exam to another to see if it improving or decreasing. Really have them guess . How well can you guess

Question 7

reason for performing this test

Answer 7

check dva every time patient comes in. diff between pathology and need for glasses change with pinhole to determine whether or not perform a refractometry or dialate eyes. discover amblyopia in a child. document best vision obtained with refractometry