Ocular Disease Midterm 1

OPT 631

97 cards   |   Total Attempts: 184
  

Cards In This Set

Front Back
What are the 4 diffferent abnormalities of corneal curvature and sizes? Define each.
- Cornea Plana: decrease in corneal curvature
- Microcornea: adult cornea is less than 10mm
- Megalocornea: adult cornea dis greater than 13mm.
- Keratoglobus: resembles megalocornea but the cornea is thin especially in the periphery.
Describe the limbal land marks and depth of anterior chamber in cornea plana.
The limbal landmark is obsured
The AC is shallow
What condition are you in risk of with microcornea? What is the high refractive error associated with this?
You're in risk of developing glaucoma due to AC crowding.
Hyperopia
When does a baby reach adult cornea size? When is a child considered to have microcornea?
~ A child reaches adult cornea size at age 3 -4

~ A baby has microcornea when the cornea is less than 9mm.
In megalocornea, are males or females more affected?
Males - because its an x-linked recessive trait
What is the critical DDx in megalocornea? What is the high refractive errror associated with it?
~ Congenital glaucoma
~ Myopia and astigmatism.
Question 7
What dysgenisis is shown here?
Corneal plana
Question 8
What dysgenisis is shown here?
Microcornea
Question 9
What dysgenisis is shown here?
Megalocornea
Question 10
What dysgenisis is shown here?
Keratoglobus
What are the 2 types of mesenchymal dysgenisis? Differentiate between both types.
Posterior keratoconnus- posterior indentation on the cornea with variable degrees of stromal hazing.
Peter's Anomaly - congenital condition with central corneal opacification, abnormal posterior stroma, descemet's and endothelium
Question 12
What type of dysgenisis is seen here?
Posterior keratoconus
Question 13
What type of dysgenisis is seen here?
Peter's anomaly
Is your VA affected with posterior keratoconnus?
No
What are the 3 different anterior chamber cleavage syndromes? Define each.
- Posterior embryotoxon: anterior displacement of schwalbe's line
- Axenfeld's anomaly or syndrome: all of the posterior embryotxon plus iris strand across the AC and attach to schwalbe's line.
Rieger's anomaly or syndrome: all of axenfelds plus iris hypoplasia.