29 Questions
What is the approximate thickness of the epithelium in the cornea?
50um
What is the primary component of the stroma, which accounts for over 90% of the corneal thickness?
Type 1 collagen and proteoglycans
What is the purpose of the Descemet's membrane?
Not specified in the provided text
What is the approximate refractive index of the cornea?
1.3375
What is the wavelength of light at which the light transmission is maximal?
700nm
What is the average radius of curvature of the cornea?
7.8mm
What is the typical location of punctate epitheliopathy?
Epithelial layer
What is the primary difference between a pterygium and a pinguecula?
Triangular shape and encroachment on the cornea
Which of the following is NOT a characteristic of keratoconus?
Bilateral symmetry
What is the typical age of onset for keratoconus?
Around puberty
What is the name of the condition characterized by degeneration of collagen fibers in the conjunctival stroma?
Pinguecula
Which of the following conditions is associated with keratoconus?
Both A and B
What is the primary consideration when dealing with an embedded foreign body in the cornea?
Checking for signs of globe penetration
What is the characteristic shape of the area of inferior corneal thinning in high increasing regular astigmatism?
Crescent shaped
How would you typically remove a superficial foreign body from the eye?
Rinsing with topical saline and a cotton bud
What percentage of Keratoconus cases require Epikeratoplasty or Penetrating keratoplasty?
10-20%
What is a risk factor for developing corneal abrasions?
Contact lens wear
What is the name of the condition characterized by greyish-white polygonal stromal opacities separate by clear spaces?
Crocodile Shagreen
What wavelength of UV light is used in Corneal collagen crosslinking?
365nm
What is the primary purpose of applying topical antibiotic ointment in cases of corneal abrasion?
To promote wound healing
What is the age-related corneal opacity that frequently occurs bilaterally and is associated with hyperlipoproteinaemia?
Arcus Senilus
What is the typical healing time after Corneal collagen crosslinking?
1 week
What is the purpose of Seidel's test in the context of ocular foreign bodies?
To detect signs of globe penetration
What is the term for the focal accumulations of collagen on the posterior surface of Descemet's membrane?
Corneal Guttata
What is the treatment option for high increasing regular astigmatism?
Scleral lenses or corneal surgery
Why is it important to assess and examine the extent of the defect in corneal abrasion?
To determine the risk of complications
At what age does Keratoglobus typically onset?
At birth
What is the age range for the onset of Pellucid Marginal Degeneration?
20-40 years
What is the name of the condition characterized by bilateral narrow crescentic lines composed of chalklike flecks at the interpalpebral fissure on the nasal and temporal limbus?
Vogt White limbal girdle
Test your knowledge of cornea anatomy, signs and symptoms of corneal problems, and clinical management guidelines. Covers corneal ectasias, degenerations, dystrophies, and surgical procedures. Useful for optometry students and professionals.
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