What is the difference between keratoconus and keratoglobus?
Keratoconus is different from keratoglobus in the age of presentation. Whereas keratoglobus presents at birth, keratoconus develops around puberty and may progress until 40–50 years of age. Keratoglobus is considered a non-progressive or minimally progressive disorder.
What is Keratoglobus?
Keratoglobus is a rare non-inflammatory corneal thinning disorder characterised by generalised thinning and globular ectasis (protrusion) of the cornea. The non-inflammatory corneal ectasias are a group of disorders characterised by corneal thinning, protrusion, and scarring.
Is keratoglobus congenital?
Disease Entity Two forms of keratoglobus exist. The congenital form is present at birth and is associated with Ehler-Danlos type VI, Leber congenital amaurosis, and the blue sclera syndrome. The acquired form presents in adulthood and may evolve from preexisting cases of pellucid marginal degeneration or keratoconus.
What causes Keratoglobus?
Causes of Keratoglobus may be: Congenital: Keratoglobus is primarily considered a congenital disorder present since birth. The congenital form of the disorder is always bilateral. The exact genetics of the disorder have not been studied in detail and no definite inheritance pattern has been described.
How can contact lens help in Keratoglobus cornea?
Corneal gas-permeable lenses can provide optimal vision, but they have poor fitting characteristics in advanced stages. The PROSE device has the advantage of masking the irregularity of the cornea with a tear lens and a contact lens power that provides a smooth refractive surface.
What is a Megalocornea?
Megalocornea is a rare nonprogressive enlargement of the cornea to 13 mm or greater; in the setting of normal intraocular pressure. The cornea and limbus are enlarged, but the cornea itself is histologically normal and of normal thickness.
What is PKP eye surgery?
Penetrating keratoplasty (PKP), also referred to as a corneal transplant or corneal graft, is the surgical removal of a damaged or diseased portion of the cornea, followed by the implantation of healthy tissue from a donated human cornea, which is usually obtained from an eye bank.
What is Fleischer’s ring?
Partial or complete iron deposition ring in deep epithelium encircling the base of the cone. Characteristic in eyes with keratoconus. Appears as yellowish to dark-brown-colored ring. Best seen using cobalt blue light.
What does Iridodonesis mean?
tremulousness
Iridodonesis is a condition in which the iris (coloured part of the eye) vibrates during eye movements. Upon moving the eye rapidly, the iris can appear to ‘dance’, or ‘tremble’ (tremulousness). This occurs when the lens becomes partially detached (lens subluxation) from its suspensory ligaments.
Is PKP a corneal transplant?
What is a lamellar keratectomy?
Concept. Lamellar keratoplasty is an operation in which diseased corneal tissue is removed and replaced by lamellar corneal tissue from a donor. The procedure is performed either to improve vision (optical keratoplasty) or to provide structural support for the cornea (tectonic keratoplasty).