| Popis: |
We evaluated the performance of the SoftPerm contact lens (Wesley Jessen) in patients with irregular astigmatism, usually due to keratoconus or after penetrating keratoplasty (PK), who were unable to befitwith, or intolerant of, rigid gas permeable (RGP) contact lenses.A retrospective study of patients fit with SoftPerm lenses in the Cornea Department at Wills Eye Hospital between March 1985 and March 2000 was performed.Thirty-five cases were reviewed, with follow-up available in 33 cases. Most of the eyes had irregular astigmatism secondary to keratoconus (22/35,62.9%) or PK (10/35,28.6%) and had failed a trial of RGP lenses. The mean logMAR visual acuity with SoftPerm lenses was 0.13+/-0.18 (range -0.12 to 0.6). In 25 cases in which comparison with glasses or RGP lenses was possible, SoftPerm lenses provided better visual acuity than glasses in 17/25 cases (68%) with a mean difference of -0.24 (P = 0.001, paired t-test); visual acuity with SoftPerm lenses was better than RGP visual acuity in 13/25 cases (52%), with a mean difference of -0.06 (P = 0.07, paired t-test). Complications included broken lenses (16/33,48.5%), giant papillary conjunctivitis (GPC) (9/33, 27.3%), and peripheral corneal neovascularization (9/33, 27.3%). The GPC and peripheral corneal neovascularization were often delayed in presentation. The major subjective complaint was discomfort (13/33, 39.4%). At the last follow-up, the SoftPerm lens was still in use in 22/33 cases (66.7%). Discomfort was the most common reason for discontinuation. The mean duration of lens wear was 52.5+/-31.7 months, range 3 to 110 months.The SoftPerm lens can provide satisfactory visual correction in many cases of irregular astigmatism with RGP failure. However, problems such as frequent breakage, GPC, peripheral corneal neovascularization, and discomfort necessitate close follow-up. |
