Disorders of the Lens & Posterior Chamber Flashcards
What is the etiology of Presbyopia?
As we age–> lens becomes hardened and loses flexibility–> makes it difficult to focus on close objects.
What are the symptoms of Presbyopia?
Slow progressive inability to focus on near objects.
Will hold books/magazines etc further away from eyes
What are the signs of Presbyopia and when do you begin seeing them?
- age: > 40 yo
- difficulty with near vision on the hand held (rosenberg eye chart)
What does 20/40 mean?
and 20/15
20/40=A patient sees at 20 feet what a person with normal vision would see at 40 Ft
-20/15= Able to see at 20 ft what a person w normal vision can see at 15.
Note: patient is always seeing at 20 ft.
If a patient cannot read the chart what do you ask them to do next?
- Count fingers
- hand motion
- Light perception
How do you record for patient when reading the chart who got all correct on the 20/30 line, but only two correct on the 20/20 line?
20/30 + 2
translates into they got two correct on the 20/20 line
what does 20/30-1 mean?
A person reading on the 20/30 line made 1 error on the line.
Another term for nearsighted?
Myopia
another term for farsighted?
hyperopia
When does Amblyopia typically begin?
Childhood
How does Amblyopia typically begin?
Begins as strabismus, where eyes are not working in perfect tandem (do not focus on the same spot simultaneously)
Where is the error for Amblyopia?
The error is in the Extraocular muscle
How do you tx Amblyopia?
Corrected through eye muscle exercise
patching one eye and forcing child to strengthen EOM (extra ocular muscle)
When can you begin treating Amblyopia?
Can be corrected in early childhood as strabismus, before amblyopia sets in.
What happens if strabismus is not corrected during childhood?
The brain will shut down the “lazy eyes” image to prevent diplopia.