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Nipple-like keratoconus: or Nipple Cone: is defined as a specific subtype of keratoconus characterized by a small; steep; and localized bulging of the cornea. The cone is typically:
Unlike "Oval" or "Sagging" cones; which are larger and often displaced toward the bottom of the eye; the Nipple Cone is perfectly central. This makes the distortion more profound because the thinning and bulging are located directly in the path of light entering the eye; leading to high levels of "coma" and other visual aberrations.
Patients often report extreme ghosting or multiple images around lights. Because the thinning is so localized and central; it creates high amounts of irregular astigmatism that cannot be corrected with standard glasses or soft contact lenses. Even with glasses; vision remains blurred and distorted due to the irregular surface of the cone.
Rigid Gas Permeable (RGP) lenses or Scleral lenses are the standard of care. Specialized "nipple cone" designs feature:
Yes: because the cone is so localized; there is significant physical stress on the apex (the tip of the cone). If a contact lens fits too tightly on that specific point (apical touch); it can lead to permanent scarring. If scarring occurs in the center; a corneal transplant may eventually be necessary to restore clear vision.
No: LASIK is strictly contraindicated for any form of keratoconus. Laser surgery would further thin and weaken the already compromised; cone-shaped cornea; potentially leading to a total corneal collapse (hydrops) and rapid vision loss.
This involves wearing a soft lens underneath a hard RGP lens. For nipple cones; this provides a protective cushion for the sensitive; steep apex while the hard lens provides the crisp vision needed to correct the irregular astigmatism and ghosting.
Yes: Corneal Cross-Linking (CXL) is often recommended to stop the progression of the nipple cone. By strengthening the corneal fibers with UV light and riboflavin; it can prevent the "nipple" from becoming steeper or thinner; potentially avoiding the need for future surgery.