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Related Concept Videos

Focusing of Light in the Eye01:16

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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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Related Experiment Video

Updated: May 11, 2025

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
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Enhancement using CIRCLE software post cornea lenticule extraction for advanced refractive correction.

Gitansha S Sachdev1, Tasneem Neemuchwala, Shreyas Ramamurthy

  • 1Refractive Services, The Eye Foundation, Coimbatore, Tamil Nadu, India.

Indian Journal of Ophthalmology
|April 17, 2025
PubMed
Summary
This summary is machine-generated.

Enhancement using CIRCLE software after corneal lenticular extraction (CLEAR) significantly improved visual acuity. This safe procedure offers a viable option for refractive correction enhancement.

Keywords:
CIRCLECLEARcorneal lenticular extraction for advanced refractive correctionenhancementfemtosecond laser

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Corneal lenticular extraction (CLEAR) is used for advanced refractive correction.
  • Enhancement procedures are sometimes necessary for under-correction or regression after primary CLEAR.

Purpose of the Study:

  • To evaluate the visual outcomes of enhancement procedures following CLEAR using CIRCLE software.
  • To assess the safety and efficacy of the CIRCLE software for retreatment.

Main Methods:

  • A prospective study involving eyes requiring enhancement after CLEAR.
  • CIRCLE software was used to create a flap, followed by excimer laser ablation to a plano target.
  • Visual acuity and safety outcomes were analyzed at three months post-enhancement.

Main Results:

  • Mean preoperative spherical equivalent was -5.04 D, with enhancement addressing a residual error of -0.86 D.
  • Final manifest spherical equivalent was -0.01 D, with significant improvement in uncorrected distance visual acuity (UDVA).
  • 78% of eyes achieved 20/20 or better UDVA post-enhancement, with no loss of corrected distance visual acuity (CDVA) or major complications.

Conclusions:

  • CIRCLE software provides a safe and effective option for visual enhancement after CLEAR.
  • This retreatment modality can successfully correct residual refractive errors and improve visual function.