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Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
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Topical Estrogen Therapy for Hyperopia Correction in Vivo.

Ari Leshno1,2, Katalin Prokai-Tatrai1, Ygal Rotenstreich1,2

  • 1,.

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Summary

Topical estrogen eye drops may induce a myopic shift by altering corneal biomechanics. This suggests potential for pharmacological manipulation of refractive errors.

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Area of Science:

  • Ophthalmology
  • Pharmacology
  • Corneal Physiology

Background:

  • In vitro studies indicate 17β-estradiol (estrogen) influences corneal biomechanical properties, reducing tissue stiffness.
  • This modulation suggests a potential role for estrogen in altering corneal refractive properties.

Purpose of the Study:

  • To investigate the hypothesis that topical estrogen administration affects corneal refractive properties.
  • To determine if estrogen eye drops induce a myopic shift in refractive error.

Main Methods:

  • Twelve female New Zealand white rabbits received either 1.5% estrogen eye drops or vehicle control for 35 days.
  • Ocular examinations, pachymetry, intraocular pressure (IOP), keratometry, and refraction were assessed weekly.
  • Statistical analysis was performed using repeated measurements to compare treatment and control groups.

Main Results:

  • Both groups showed corneal flattening and a hyperopic shift, but the rate of change was slower in the estrogen group.
  • Estrogen treatment resulted in significantly steeper keratometry readings (up to 0.6 diopters) compared to the control group (P = 0.034).
  • These refractive changes were temporary, diminishing after treatment cessation; no significant changes in IOP or pachymetry were observed.

Conclusions:

  • Topical estrogen eye drops induced a myopic shift in rabbit corneal keratometry readings.
  • These findings suggest that corneal refractive power can potentially be manipulated pharmacologically.
  • Further research is warranted to explore the physiological mechanisms for developing novel treatments for refractive errors.