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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Related Experiment Video

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Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
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Efficacy Comparison Between Steep-Meridian Incision and Non-Steep-Meridian Incision in Implantable Collamer Lens

Shengtao Liu1, Jingying Liu2, Feng Lin1

  • 1Key Lab of Myopia, Ministry of Health, Department of Ophthalmology, EYE & ENT Hospital of Fudan University, Shanghai, China.

Ophthalmology and Therapy
|April 4, 2023
PubMed
Summary

Steep-meridian corneal relaxing incisions (SM-CRI) combined with implantable collamer lens (ICL) surgery significantly reduce residual astigmatism. This approach improves visual outcomes compared to non-steep-meridian corneal relaxing incisions (NSM-CRI) in patients with myopia and astigmatism.

Keywords:
Astigmatism correctionImplantable collamer lens surgeryNon-steep-meridian incisionSteep-meridian incision

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Astigmatism correction is crucial for visual acuity.
  • Implantable Collamer Lens (ICL) surgery is a common refractive procedure.
  • Corneal relaxing incisions can be used adjunctively with ICL surgery.

Purpose of the Study:

  • To compare visual outcomes of ICL surgery with astigmatism correction using steep-meridian corneal relaxing incisions (SM-CRI) versus non-steep-meridian corneal relaxing incisions (NSM-CRI).
  • To evaluate the efficacy of SM-CRI in reducing residual astigmatism and improving refractive accuracy after ICL implantation.

Main Methods:

  • Seventy eyes of 70 patients with myopia and myopic astigmatism underwent ICL V4c implantation.
  • Patients were divided into two groups: SM-CRI and NSM-CRI.
  • Refractive outcomes and vector analysis were assessed preoperatively and 6 months postoperatively.

Main Results:

  • All participants achieved uncorrected distance visual acuity (UDVA) of 20/20 or better postoperatively.
  • The SM-CRI group demonstrated significantly smaller residual astigmatism (difference vector) compared to the NSM-CRI group (P=0.021).
  • The SM-CRI group showed a higher correction index (0.84 vs. 0.67, P=0.013) and a smaller absolute mean angle of error (10.13° vs. 23.88°, P=0.038).

Conclusions:

  • SM-CRI is effective in alleviating corneal astigmatism during ICL surgery.
  • This technique allows for a reduced cylindrical diopter of the ICL, enhancing refractive precision.
  • SM-CRI improves postoperative visual quality compared to NSM-CRI in correcting myopic astigmatism.