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Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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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Published on: September 20, 2024

Optical biometry in combined phacovitrectomy.

Sridhar R Manvikar1, David Allen, David H W Steel

  • 1Sunderland Eye Infirmary, Sunderland, United Kingdom. sridharrm@hotmail.com

Journal of Cataract and Refractive Surgery
|December 23, 2008
PubMed
Summary
This summary is machine-generated.

Optical biometry with the Haigis formula accurately calculates intraocular lens (IOL) power in combined phacovitrectomy for macular conditions. This method avoids the myopic shift sometimes seen with ultrasound biometry.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Combined phacovitrectomy is a surgical procedure for macular hole and pucker.
  • Accurate intraocular lens (IOL) power calculation is crucial for visual outcomes after cataract surgery.
  • Optical biometry offers a non-contact method for measuring eye dimensions.

Purpose of the Study:

  • To evaluate the precision of optical biometry using the Haigis formula for IOL power calculation in patients undergoing combined phacovitrectomy.
  • To compare refractive outcomes with historical control groups.

Main Methods:

  • A retrospective case series of 59 patients undergoing combined narrow-gauge phacovitrectomy for macular hole or pucker.
  • IOL power was determined using optical biometry and the Haigis formula.
  • Refractive prediction error (ME, MAE) was calculated and compared to sequential and standard phacoemulsification groups.

Main Results:

  • The phacovitrectomy group (n=59) showed refractive outcomes (ME -0.02, MAE 0.39) comparable to a sequential phacoemulsification group (n=42).
  • A statistically significant difference was observed when compared to a phacoemulsification-only group (n=60) (ME 0.08, MAE 0.26).
  • No myopic shift was detected, unlike some ultrasound biometry findings.

Conclusions:

  • Optical noncontact biometry with the Haigis formula provides accurate IOL power estimation for combined phacovitrectomy.
  • This technique is reliable and does not induce a myopic shift, offering an advantage over ultrasound biometry.