Abstract
Background: Currently there are four general approaches to correct refractive errors: refractive corneal surgery, crystalline lens surgery and implantation of an intraocular lens in anterior or posterior chamber. Aim: To evaluate the predictability, safety and stability of toric phakic implantable collamer lens implantation to correct moderate to high myopic astigmatism. Methods: Sixty eyes of 40 patients underwent implantation of a toric implantable collamer lens (V4c design) in the Eye Specialty Private Hospital, Baghdad, Iraq were studied. The mean spherical refraction was -11.32±3.17 diopter (D) with a range of -6.00 to -18.00 D and a mean cylinder of -2.61±1.16 with range of -1.00 to -5.50 D. The outcome measures that evaluated during a 12 months follow-up period include UDVA, refractive outcomes, CDVA, vault and adverse events. Results: At 12 months postoperatively, the mean Snellen decimal UDVA was 0.77±0.23 and the mean CDVA was 0.80±0.21, with an efficacy index of 1.16. Twenty nine eyes (48.33%) showed gain in CDVA with a safety index of 1.21. The treatment was highly predictable for spherical equivalent and astigmatic component. The mean SE dropped from -12.63±3.11 D to -0.11±0.20 D with 58 eyes within ±0.50 D and 60 eyes with ±1.00 D of the target correction. For achieved cylinder 60 eyes (100%) had ≤0.50 D and 51 eyes (85%) had ≤0.25 D with a strong positive linear correlation between achieved and expected cylinder (r=0.94). Conclusion: The results of the present study support safety, efficacy, predictability of toric implantable collamer lens implantation to treat moderate to high myopic astigmatism Abbreviation: UDVA: uncorrected distance visual acuity, CDVA: corrected distance visual acuity, SE: spherical equivalent and ACD: anterior chamber depth
Highlights
Laser corneal refractive surgery has been used to correct wide range of refractive errors and proved to be effective and safe in most cases
The aim of the current study was to determine whether implantation of the toric implantable Collamer Lens PIOL is safe, predictable, and effective for moderate to high myopic astigmatism correction and to analyze the benefits or disadvantage related to the new design
In order to compare with previous studies that reported data of the toric ICL, a 1 y follow-up study showed that toric ICL (V4 design) implantation is highly predictable, stable and safe up to 12 months postsurgery
Summary
Laser corneal refractive surgery has been used to correct wide range of refractive errors and proved to be effective and safe in most cases. In the absence of contraindication, PIOL implantation is the best approach in young patient with a moderate to high refractive errors and in those who have contraindication to keratorefractive procedure. The. Currently there are four general approaches to correct refractive errors: refractive corneal surgery, crystalline lens surgery and implantation of an intraocular lens in anterior or posterior chamber. Aim: To evaluate the predictability, safety and stability of toric phakic implantable collamer lens implantation to correct moderate to high myopic astigmatism. Methods: Sixty eyes of 40 patients underwent implantation of a toric implantable collamer lens (V4c design) in the Eye Specialty Private Hospital, Baghdad, Iraq were studied. Conclusion: The results of the present study support safety, efficacy, predictability of toric implantable collamer lens implantation to treat moderate to high myopic astigmatism
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