Symptoms of Pigmentary Dispersion SyndromeSymptoms of PDS are most likely caused by sudden increases in eye pressure. The condition can cause episodes of symptoms, including the following:
- Blurred vision
- Colored halos around lights
- Mild ocular pain
Risk Factors for Pigmentary Dispersion SyndromeWhile anyone can develop PDS, it seems to be much more common in younger, white males between the ages of 20-40. Interestingly, most people who develop PDS are nearsighted.
Causes of Pigmentary Dispersion SyndromePDS is caused by excess pigment floating around in the eye that has been released from the back side of the iris. Some people have a unique eye anatomy that causes the lens zonules to rub abrasively onto the back of the iris. Lens zonules are thin fibers that hold the crystalline lens of the eye in place right behind the iris. As the iris and lens changes shape, the zonules chafe against the iris and the pigment begins to flake off.
Diagnosis of Pigmentary Dispersion SyndromeBecause the pigment floats around, it gets deposited onto the back surface of the cornea in a vertical pattern. In eye care, this pigmentary deposition is known as "Krukenberg's Spindle." Because this pigment comes off the back of the iris, the doctor can also see "transillumination of the iris." That means the doctor sees slit-like defects in the iris where light passes through because of the lack of pigment. By using gonioscopy, he or she can observe excess pigment that is deposited in the drainage canal of the eye. Eye pressure may or may not be elevated. If the patient has developed pigmentary glaucoma, then signs of glaucoma can also be seen.
What You Should Know About Pigmentary Dispersion SyndromeIt is important to note that all people that have PDS will not develop pigmentary glaucoma. Eye pressure may fluctuate widely in patients with PDS or pigmentary glaucoma. Only about 30% of people with PDS will develop pigmentary glaucoma. Do not be surprised if your doctor asks you about your exercise habits. PDS symptoms seem to occur more during exercise. It is thought that the vigorous movement of exercise may cause more pigment to be released. When more pigment is released, eye pressure can rise and cause the associated symptoms.
The best thing you can do is to return for examinations annually or more often as directed by your doctor. Pigmentary glaucoma, unlike the more common "open angle glaucoma," should be diagnosed quickly and treated aggressively.
Alexander, Larry J. Primary Care of the Posterior Segment, Second Edition. Appleton & Lange, 1994.