Objective: To evaluate the use of the intracorneal ring (ICR; Intacs, Addition Technology, Inc., Fremont, CA) for the treatment of pellucid marginal degenerat ion (PMD). Design: Case series. Participants: Eight patien...Objective: To evaluate the use of the intracorneal ring (ICR; Intacs, Addition Technology, Inc., Fremont, CA) for the treatment of pellucid marginal degenerat ion (PMD). Design: Case series. Participants: Eight patients with PMD who were i ntolerant to contact lenses received ICR segments in the superior cornea (0.25 m m thickness) and in the inferior cornea (0.45 mm thickness). The diagnosis was s upported by Orbscan II tomography (Bausch &Lomb). Main Outcome Measures: Preope rative and postoperative uncorrected visual acuity, best spectacle-corrected vi sual acuity (BSCVA), refractive astigmatism, and spherical equivalent were asses sed. Changes in corneal shape were evaluated by corneal tomographic maps. Result s: The minimum follow-up was 12 months (range, 12-42 months; standard deviation [SD], 14.14). Uncorrected visual acuity improved in all 8 e yes (100%). At the last postoperative examination, 6 eyes (75%) had a BCVA < 2 0/25; mean postoperative refractive astigmatism was-2.53 (range,-4.50 to-1.25 ; SD, 1.03). Mean postoperative spherical equivalent was-1.52 (range,-7.25 to +1.87; SD, 3.01). At the third postoperative month, refractive stability was ob tained. No patients lost any Snellen lines of BCVA. No intraoperative and postop erative complications occurred. Conclusions: Intracorneal ring implantation is a promising new treatment for patients with early to moderate PMD and who are int olerant of contact lenses.展开更多
文摘Objective: To evaluate the use of the intracorneal ring (ICR; Intacs, Addition Technology, Inc., Fremont, CA) for the treatment of pellucid marginal degenerat ion (PMD). Design: Case series. Participants: Eight patients with PMD who were i ntolerant to contact lenses received ICR segments in the superior cornea (0.25 m m thickness) and in the inferior cornea (0.45 mm thickness). The diagnosis was s upported by Orbscan II tomography (Bausch &Lomb). Main Outcome Measures: Preope rative and postoperative uncorrected visual acuity, best spectacle-corrected vi sual acuity (BSCVA), refractive astigmatism, and spherical equivalent were asses sed. Changes in corneal shape were evaluated by corneal tomographic maps. Result s: The minimum follow-up was 12 months (range, 12-42 months; standard deviation [SD], 14.14). Uncorrected visual acuity improved in all 8 e yes (100%). At the last postoperative examination, 6 eyes (75%) had a BCVA < 2 0/25; mean postoperative refractive astigmatism was-2.53 (range,-4.50 to-1.25 ; SD, 1.03). Mean postoperative spherical equivalent was-1.52 (range,-7.25 to +1.87; SD, 3.01). At the third postoperative month, refractive stability was ob tained. No patients lost any Snellen lines of BCVA. No intraoperative and postop erative complications occurred. Conclusions: Intracorneal ring implantation is a promising new treatment for patients with early to moderate PMD and who are int olerant of contact lenses.
