Lecture 19: Vision Through The Lifespan Flashcards
Driving limit in flordia
20/70
Sharpness of vision, measured by the ability to discern letters or numbers at a given distance according to a fixed standard
acuity
What is legal blindness
best corrected >20/200
so you can have someone whos legally blind who can see something
Shellen eye chart
at what age can a child attend to black and white and contrasting pattern
birth-10 days
Know: children can see better lateral vision than midline (head isnt really in midline) at birth - 10 days
How many days does it take for a baby to determine mother?
4 days
by sound/smell at birth
are eyes more accurate than extremetities at 1 month
yes
* can track w/ eyes better than hands
at what are is vision acuity 20/800-20/200
month 1
NOTE: tracking is not smooth but improving
at what month is 20/150
month 2
NOTE: at month2 greatest visual stability when head is turned to side rather than in midline (because they’re not having to think about keeping hd up)
when is baby able to track object 180 degrees?
3 months
at what month is vision 20/60
month 3
at what month does baby get depth percention
month 6
this normally doesnt start until they start moving
at what month can a baby diliniate between colors?
* what 3 colors first
Month 6
* begins as black and white and red
What is babies acuity at month 6
20/20
conditions of the eyes
* Strabismus
* Myoptia
* Hyperopia
* Astigmatism
Eyes do not properly align/converge
* If this happens to kids what happens
* What about adults?
Strabusmus
Children loss = loss of depth perception (think lazy eye)
Adults = double vision
What is myopia?
Nearsighted
* can’t see far away
Most common cause of impared vision in people under 40
typically begins in chuldhood
higher risk if parents are nearsighted
Most cases-stabilizes in early adulthood
Difficulty seeing distances
able to see close
S/s
* Squinting
* eye strain
* HA
farsightendness
hyperopia
* can see distant objects clearly
* objects nearby may be blurry
* usually is present at birth
* tends to run in families
s/s
* nearby objects may appear blurry
* squnt to see clealy
* eyes strain, uncluding burning eyes, and aching in or around the yes
* generally eye discomfort or HA after prolonged interval close tasks, such as reading, writing, computer work or drawing
Cornear irregularly shaped
Causes blurred vision
Affects near and far vision
astigmatism
near and far vision
you also see halos around lights
note: you can have perfect acuity and have an astigmatism
at 40’s cant see close up anymore - presbyopia
illumination
older needs more light to read
