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Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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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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Related Experiment Video

Updated: Jun 20, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

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Published on: September 20, 2024

[A new toric diffractive multifocal lens for refractive surgery].

A Liekfeld1, N Torun, L Friederici

  • 1Klinik für Augenheilkunde, Klinikum Ernst von Bergmann gGmbH, Potsdam, Deutschland. aliekfeld@klinikumevb.de

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|September 30, 2009
PubMed
Summary
This summary is machine-generated.

The new toric multifocal lens offers a promising solution for refractive surgery, correcting myopia, hyperopia, and astigmatism. Early results show high patient satisfaction and excellent visual acuity post-implantation.

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Published on: September 16, 2025

Area of Science:

  • Ophthalmology
  • Refractive Surgery

Context:

  • Traditional refractive surgery options for complex refractive errors like high myopia, hyperopia, or presbyopia combined with astigmatism were limited.
  • Bioptics, a combination of lens and corneal surgery, was previously the primary approach.
  • The introduction of a toric diffractive bifocal intraocular lens (IOL) in 2007 provided a new surgical alternative.

Purpose:

  • To evaluate the initial outcomes of refractive lens exchange using a novel toric diffractive bifocal IOL.
  • To assess the efficacy and safety of this new IOL in correcting combined refractive errors.

Summary:

  • Refractive lens exchange was performed on 10 eyes of 6 patients (ages 25-57) using the Acri.LISA toric IOL.
  • Preoperative astigmatism ranged from 1.5 to 5.75 diopters, with coexisting myopia or hyperopia.
  • Postoperative uncorrected visual acuity ranged from 0.5 to 1.25, and best-corrected visual acuity from 0.8 to 1.25.
  • Postoperative spherical equivalent was 0 to +1.0 diopters, with astigmatism reduced to 0-1.0 diopters.
  • Excellent rotational stability of the IOL was observed up to one year post-surgery.
  • Patient satisfaction levels were reported as very high.

Impact:

  • The toric diffractive bifocal IOL represents a significant advancement in refractive surgery options.
  • Initial results suggest this lens is a viable and effective treatment for combined refractive errors.
  • Further studies and comparative analyses with bioptics are warranted to fully establish its role.