Visual Development Flashcards
What is a quantitative method for assessing vision in babies?
Teller acuity cards
What are the eye movement developments?
-saccades
Smooth pursuit
-OKN
-vergence
Information and example of saccades
It’s fast eye movement so includes several changes.
Example- put 2 finger up and look finger to finger.
Present at birth but not normal- often hypometric
Develop quickly
Info and example of smooth pursuits
Example- 1 finger up and move it and track it
-not at birth-starts about 2 months
Info about OKN
-at birth asymmetric
-temporal to nasal normal
-nasal to temporal absent until 3/12
Info about vergence
-measurable by 10-16 weeks
-measure of binocular vision so we need to have decent vision in each eye so we can create on image
What are the 3 things the critical period development include
-development
-sensitive- lose what you have
-recovery
What are the 3 things the critical period development include
-development
-sensitive- lose what you have
-recovery
Accommodation
(Lens change quickly but with newborn it’s slow)
- sluggish
-in appropriate direction but inaccurate
There is Higher refractive error at birth- what does emmetropisation mean
The process of eye growth of different eye components (length, corneal curvature and lens thickness) resulting in emmetropia (where light rays are focused directly on the retina when focusing in the fat distance)
Is the optic nerve myelinated
Yes-
Myelin is present at birth (as early as 32 weeks)
Most fibres myelinated by 7 months
Large increase in thickness of myelin in first two years of life
Continued development after two years
What type of movement does teller acuity cards require
Saccades
What does amblyopia mean
Visual impairment without apparent organic pathology.
What is a measurement of vision
Normative data- is it normal for there age?
