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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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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
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Topography-Guided vs Wavefront-Optimized Surface Ablation for Myopia Using the WaveLight Platform: A Contralateral

Khalil Ghasemi Falavarjani1, Masih Hashemi, Mehdi Modarres

  • 1Eye Research Center, Iran University of Medical Science, Iran. drghasemi@yahoo.com

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|March 31, 2010
PubMed
Summary

Wavefront-optimized and topography-guided photorefractive keratectomy (PRK) showed similar visual acuity and contrast sensitivity outcomes for low to moderate myopia. Both PRK treatments offer comparable results for improving vision in patients with myopia and astigmatism.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Photorefractive keratectomy (PRK) is a common refractive surgery procedure.
  • Advancements in excimer laser technology have led to different ablation strategies, including wavefront-optimized and topography-guided treatments.
  • These advanced techniques aim to improve visual outcomes and reduce visual aberrations after refractive surgery.

Purpose of the Study:

  • To compare the efficacy and visual outcomes of wavefront-optimized PRK versus topography-guided PRK.
  • To evaluate differences in visual acuity, refractive error, contrast sensitivity, and corneal irregularities between the two PRK methods.
  • To determine which PRK approach yields superior results for patients with low to moderate myopia with or without astigmatism.

Main Methods:

  • A prospective, randomized, contralateral study design was employed.
  • Forty eyes (20 patients) with low to moderate myopia underwent PRK.
  • One eye received topography-guided PRK, while the fellow eye received wavefront-optimized PRK. Visual acuity, refractive error, contrast sensitivity, and corneal irregularities were assessed preoperatively and at 3 and 6 months postoperatively.

Main Results:

  • No significant differences were observed in corrected distance visual acuity (CDVA) or uncorrected distance visual acuity (UDVA) between the two groups at any postoperative time point.
  • All wavefront-optimized eyes and 90% of topography-guided eyes achieved UDVA of 20/20 or better.
  • Pre- and postoperative refractive errors, corneal irregularities, and contrast sensitivity measurements showed no statistically significant differences between wavefront-optimized and topography-guided PRK.

Conclusions:

  • Wavefront-optimized and topography-guided PRK treatments result in statistically similar CDVA and contrast sensitivity outcomes.
  • Both ablation strategies are effective for correcting low to moderate myopia with or without astigmatism.
  • The choice between wavefront-optimized and topography-guided PRK may not significantly impact visual outcomes in this patient population.