Hickenbotham

Question 1

You have a +2 D uncorrected hyperope. With an accommodative amplitude of 6D. What is a comfortable close distance form them for long period of time (1/2 of amp of accom)?

Answer 1

6/2=3
3-(+2)=1
1/1=1m

1m is final answer

Question 2

Your emmetropic patient wants to read their computer monitor at .8m. What is the minimum accommodation necessary to see the monitor clearly. Assume +/- .25D depth of focus.

Answer 2

1/.8=1.25

1+/-.25= 1 to 1.5

Minimum = 1D

Question 3

You have a -2 D myopic patient that has an accommodative amplitude of 8D. What is their near point?

Answer 3

-2 - 8 = -10D

1/-10 = 10cm in front

Question 4

Automatic adjustment to keep clear image on retina

• up to 2D blur
• largest and most important component of accommodation

Answer 4

Reflex accom

Question 5

Innate neurological linking and action of fusional vergence

• .4D per meter angle
• 2nd major component of accom

Answer 5

Vergence accom

Question 6

Due to nearness of an object

- within 3m

Answer 6

Proximal accom

Question 7

What is left over after removing the other 3 types of accom

-reduces with age

Answer 7

Tonic accom

Question 8

What is the method for accommodation (anatomically)?

Answer 8

Ciliary muscle contraction causes relaxation of the lens zonules

Question 9

Your 45 year old patient says he has no problems with either reading or distance. You measure the spec Rx as:
OD: -100 -025x180
OS: +025 -050x170
Add: +100

What kind of presbyope are they, if they are one?

Answer 9

Objective

Question 10

After correcting distance, this kind of presbyope still needs an add power

Answer 10

Objective

Question 11

Which type of presbyope are typically myopes?

Answer 11

Objective

Question 12

After correcting distance, this kind of presbyopic doesn’t need further addition to correct their reading

Answer 12

Functional

Question 13

Hyperopes are typically which kind of presbyope

Answer 13

Functional

Question 14

You measure the prescription of a 5 year old in an auto. Your ret showed +1D. The auto shows -3D. Which form of accom might account for the different results?

Answer 14

Proximal

Question 15

A -2D myope is overminused. She wears a -4D spec correction. If she has an 8D amp of accom, what is the location of her near point when wearing the glasses?

Answer 15

2 - 8 = -6D
- because they are already using 2d bc of overminus, they become a +2 hyperope

1/-6 = 16cm in front of eye

Question 16

Disparity between retinal defocus and accommodative mechanism

Answer 16

Lag/lead accom

Question 17

When you look at something close for so long, and you look up to see something in distance you cannot see bc eyes still in accom state

Answer 17

Accommodative spasm

Question 18

Uncorrected Myopes need to accomm ____

Answer 18

Less

Question 19

Uncorrected Hyperopes need to accomm ____

Answer 19

More

Question 20

When corrected with CL, accomm is

Answer 20

Same as emmetrope

Question 21

Formula when finding the power of a pt at the corneal plane using their vertex distance

Answer 21

P
______
1-dP

P= what they are (ex: -5D myope)
d= vertex distance

Question 22

What is an approx add for 40-44

Answer 22

+100

Question 23

What is an approx add for 45-49

Answer 23

+150

Question 24

What is an approx add for 50-54

Answer 24

+200

Question 25

What is an approx add for 55-59

Answer 25

+225

Question 26

What is an approx add for 60+

Answer 26

+250