What Is Spheroidal Degeneration?

The UV Connection (Climatic Droplet Keratopathy)

The single biggest risk factor for this condition is chronic exposure to ultraviolet (UV) radiation. It is most commonly seen in men who work outdoors in harsh environments, such as fishermen, farmers, or welders. The condition earned the name "Labrador Keratopathy" because it was frequently diagnosed in populations living in snowy or icy regions where UV light reflects off the ground and hits the eye from multiple angles. The UV radiation damages the corneal collagen and plasma proteins, causing them to denature and clump together into the characteristic spheroids.

Stages of Severity

Doctors classify the severity into three grades:

Grade 1 - The deposits are microscopic and located only at the extreme periphery (edge) of the cornea (3 o'clock and 9 o'clock positions). The patient usually has no symptoms and normal vision.

Grade 2 - The droplets spread inward, reducing corneal transparency. The patient may experience reduced vision (20/40 to 20/100) and increased light sensitivity.

Grade 3 - Large, raised nodules form in the central visual axis. The corneal surface becomes irregular, leading to significant vision loss (20/200 or worse) and a sensation of a foreign body in the eye.

Primary vs. Secondary Forms

While the classic form is "primary" (caused by the sun), there is also a "secondary" form. Secondary spheroidal degeneration occurs in eyes that are already diseased or damaged from other causes, such as chronic glaucoma, herpetic keratitis, or long-standing corneal edema. In these cases, the protein deposits form over the existing scar tissue, complicating the original condition. The mechanism is similar (protein degeneration), but the trigger is chronic inflammation rather than just UV light.

Treatment: Scraping and Surgery

In mild cases, the best treatment is prevention: wearing UV-blocking wraparound sunglasses to stop progression. For advanced cases where vision is blocked, surgical intervention is necessary. Because the deposits are superficial, a surgeon can often remove them using a superficial keratectomy (manually scraping the surface). In more severe cases, Phototherapeutic Keratectomy (PTK) using an excimer laser is used to smooth the corneal surface. Full corneal transplants are rarely needed unless the degeneration goes unusually deep.