AAO chapter 8

Global incidence of KC

• 1 in 1000

• 1 in 100000

• 1 in 2000

• 1 in 20000

Which of the following are risk factors for KC...

• atopic disease and allergic keratoconjunctivitis

• contact lens wear

• eye rubbing

• ablative keratorefractive surgery

What was the incidence of asthma in KC according to Dundee University Scottish Keratoconus Study (DUSK)

• 55%

• 30%

• 23%

• 33%

All the following are true statements about KC except.......

• Typically, the central, inferior paracentral, or inferior midperipheral cornea undergoes

  progressive thinning and protrusion

• Progression typically slows in the fourth de cade of life

  and is unusual after the age of 40 years

• There

  is a slight male preponderance

• The rate of progression of KC is highest in children

The reason for KC in developmental delay as well as in patients with low vision is probably due to

• oxidative stress

• abnormalities in collagen

• habitual eye rubbing

• genetic predisposition

All of the following are conditions commonly associated With Keratoconus except

• Mitral valve prolapse

• Floppy eyelids

• Retinopathy of prematurity

• Leber hereditary optic atrophy

Reticular scarring is due to breaks in............

• Endothelium

• Bowman layer

• Deep stroma

• DM

Match the following

• Pellucid marginal degeneration

• 
• Keratoconus

• 
• Keratoglobus

• 

Corneal edema following hydrops typically clears within .....

• 6 weeks

• 3months

• 2 months

• 6 months

Topography findings in KC includes all the following except...

• increased overall steepening (>47.20 diopters

• increase in inferior- superior (I- S) ratio (I/S >1.2 is considered significant)

• skewing of the radial axes (SRAX) >31° is considered suggestive of KC

• inferior steepening