Symptoms of Keratoconus are often diagnosed in the teenage years. Many patients will have had a history of allergies, hayfever, asthma, or eczema, possibly due to excessive rubbing of the eyes. Some studies have found that PMD might be more apparent in women. Keratoconus is more likely to occur in men. About 3% of cases with corneal ectasia resulted in a PMD diagnosis with the other 97% having keratoconus. Keratoconus is quite a rare disorder and PMD is an even more rare eye disorder. There is often no hereditary link, but if you have a first-degree relative with keratoconus, you are at higher risk than the general population of developing this eye disease. It is a bit more complicated with Keratoconus. There is no known hereditary link for those with PMD. If the cone shape is away from the cornea, a patient with keratoconus can often be confused to have PMD. In PMD, cornea thinning extends 1–2 mm away from the inferior limbus while in keratoconus, the thinning usually occurs in the paracentral region. The cornea of a patient with keratoconus is cone-shaped rather than the dome shape of a healthy eye. It is sometimes referred to as a “beer belly” configuration when you view it from the side. This shows as the thinning of the corneal band with the cornea protruding above the thinning. PMD shows severe inferior crescent-shaped thinning of the cornea. Treating and managing these eye disorders is different so it is important to have a keratoconus or PMD specialist working with you to get the proper diagnosis. There is some discussion of whether PMD is a form of keratoconus or its own eye disease entirely. It is possible for a person to have both eye conditions but this is quite rare. While they may have similar topographic features, they have slightly different cornea abnormalities. Overall the patient was happy and noted improved quality of vision.Keratoconus and Pellucid Marginal Degeneration (PMD) are both considered to be cornea ectatic disorders or corneal thinning disorders. We were able to minimize the glare/halo with the UltraHealth FC. The patient has pellucid degeneration and the lens would decenter slightly inferiorly which resulted in a small amount of residual glare/halo. This fit was more challenging due to the expectations/needs of the patient. Patient was wearing glasses before, and is extremely happy to be in contact lenses that work for most activities. He states he is happy overall, but still has some halos/glare at night. The patient wears the lenses 12-14 hours a day. At this visit the patient preferred a combo of the UH-FC OD and original UH OS because the shadowing was minimized. When the UH-FC lens came in the patient preferred the standard UH, although acuity was equal. Patient wanted to compare glare/halo between the two lenses. He persisted and an UltraHealth-FC was tried OS. I advised the patient he was doing well and not to change OS. At follow-up the patient was happy OD and wanted to try UltraHealth FC (UH-FC) on his left eye (he was already wearing UltraHealth (UH). Patient stated clarity was great but glare/halo was annoying. The original lens OD, UltraHealth, at follow-up was minimally tight fitting and inferiorly decentered. He feels his vision has improved with the contact lenses. The patient is happy with the acuity and ability to wear contacts. Patient is also in a band and had high visual demands for night driving and dim environments. The patient had corneal cross linking on both eyes and presented needing an improvement to vision for work. The patient is a firefighter/paramedic who was diagnosed with pellucid marginal degeneration OU. Kristi Rhodes, Schwartz Laser Eye Center, AZ
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |