Cogan’s dystrophy

What is Cogan’s dystrophy?

Cogan’s dystrophy, also known as Cogan’s syndrome, Cogana, is a condition affecting the cornea of the eye. It has a genetic basis and leads to a gradual deterioration of vision. What symptoms does it cause, what does the treatment process look like, and can it affect eligibility for laser vision correction? We answer these questions below.

Most Common Symptoms

In the early stages, the condition is often asymptomatic and may go undiagnosed for a long time. However, corneal changes are visible to an ophthalmologist during an eye examination. The symptoms reported by patients are usually associated with recurrent corneal erosions and include:

• blurred vision,
• tearing,
• eye redness,
• light sensitivity,
• sensation of a foreign body in the eye.

Treatment

Depending on the severity of the symptoms and the condition of the cornea, the ophthalmologist selects the appropriate form of therapy:

• Pharmacological treatment – use of preservative-free eye ointments (e.g., with antibiotics), typically applied at night.
• Bandage contact lens – not a form of treatment per se, but it helps reduce discomfort by protecting the surface of the eye from external factors.
• Corneal epithelial abrasion – mechanical removal of the affected epithelial layer.
• Micropuncture – performed either with a specialized laser or mechanically.
• Phototherapeutic keratectomy (PTK) – a laser-based procedure using an excimer laser to treat the corneal surface.

Cogan’s dystrophy and laser vision correction

Cogan’s dystrophy is not an absolute contraindication for the laser vision correction procedure, but only in the case of surface techniques that involve removal of the corneal epithelium—such as TransPRK or LASEK.

The use of LASIK techniques (SBK LASIK or FemtoLASIK (https://www.artlife.com.pl/posts/sbk-lasik-and-femtolasik-1451.php)) is not recommended in such cases due to the increased risk of abnormal healing and the possibility of corneal flap displacement, especially if the eye is rubbed as a result of pain caused by the dystrophy.

If corneal scarring is diagnosed as part of Cogan’s dystrophy, the patient will not be eligible for laser vision correction. Although this situation is rare, it requires individual assessment. However, if the visual deterioration is caused by the dystrophy itself rather than a refractive error, the ophthalmic surgeon may consider phototherapeutic keratectomy (PTK) as a treatment option.

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