Midterm 1 Flashcards
What is the Mohindra technique? How do you perform it?
Mohindra technique is a near retinoscopy technique to assess a distance refractive error.
-Use dark room
-infant fixates on retinoscope light
-Neutralize with skiaskopy bars
-Subtract 1.25 Diopters from the final result. DO NOT SUBTRACT WORKING DISTANCE
What are structural changes happen to the crystalline lens as we age?
Adds layers to the lens but flattens.
How does the power change of the cornea as we age into adulthood?
The power gets smaller.
Childs power of the cornea is 49D and decreases.
What does larsen mean?
Means the eye is changing and lens is thinning until about the age of 3-4 years old.
What does 15/16 mean when doing bell retinoscopy? How do you find how much the patient is accommodating?
Means first “with-to-against” motion was at 15 cm and “Against-to-with” was at 17 cm.
Take their blur point distance,find diopters, and subract wokring distance (2D) from their results.
What is an objective correlate of FCC?
Monocular Estimate Method
Doctor dips retinoscope in front of patiens eye 1/5 of second to avoid accommodation. Doctor Guesses their lag or lead.
What test measures amount of accommodation at near?
Minus lens procedure ( PRA)
How to find patient’s average amplitude for age? (Hofstetter’s average amp)
18.5 - 1/3(age)
How do you find patient’s minimum amplitude?
15 - 1/4(age)
Swedish study equation to find amp
(15-1/4(age)) - 2
What are the z score elements (4)
Vertical
Horizontal time - adjusted time +timex 80/ (80- ommissions +additions)
Errors
Ration - horizontal adjusted time / vertical adjusted
Z score equation
actual mean/ standard deviation
According to Banks, when does accommodation mature?
Able to accommodate starting at 1 month and is able to completely accommodate at 3 months.
When does an accurate response of accommodation occur?
2-3 months
How do you test accommodation on infants/toddlers/ preschoolers/school-aged kids?
Near retinoscopy
How do you test accommodation from school aged kids and beyond?
Near point of accommodation
When testing pursuits by doing the NSUCO test, what are the directions you follow in order?
Horizontal
Vertical
Diagonals
Circles
z-axis
stop/start
speed change
When do saccades become adult like?
13 months.
Do we pay more attention to saccades or pursuits?
saccades
What paper tests can you do to test saccades?
Development Eye Movement
King Devik
What does the 4 dot procedure measure?
stereo
If patient sees 2 red dots on 4 dot test, what would the patient be doing?
OS supression
If patient sees 3 green dots on 4 dot test, what would the patient be doing?
OD supression
What stereo test does not require stereo or red green glasses?
Lang test
