Cornea (Wills Eye Institute Atlas Series)

Keratoconus 111

P

Q

FIGURE 4-1. ( continued ) P. A hypertrophic nodule is present at the apex of the cone. These nodules can occur de novo or related to rigid contact lens wear. Such a nodule can affect vision and/or interfere with comfortable contact lens wear. These nodules can be removed with a superficial keratectomy with a blade or excimer laser phototherapeutic keratectomy. Q. Acute corneal hydrops occurs when the cornea stretches to such a degree that a tear develops in Descemet membrane, allowing a sudden inflow of aqueous fluid into the corneal stroma. The corneal stroma can swell to greater than five times its normal thickness. Acute hydrops are associated with a sudden decrease in vision and an increase in pain.

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