Study: OVDs may alter IOL power calculations

Take Home: The presence of an ophthalmic viscosurgical device may alter the optical results of intraoperative aberrometry, but prevent the need for wound stromal hydration.

 

By Lynda Charters; Reviewed by Samuel Masket, MD

Los Angeles-Though use of aberrometry intraoperatively increases the accuracy of IOL power calculations, the presence of an ophthalmic viscosurgical device (OVD) can negate the need for wound stromal hydration, and may alter the optical results provided by aberrometry, according to Samuel Masket, MD.

 

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“The metric by which patients measure ophthalmologists is often by the uncorrected visual acuity after surgery,” said Dr. Masket, clinical professor, David Geffen School of Medicine, University of California at Los Angeles. “Cataract surgeons do not achieve the same visual outcomes as LASIK surgeons, nevertheless, that is how [they] are judged.

To reach the high bar set by patients, aberrometry is being used intraoperatively, because the instrument provides the aphakic refraction. The position and thickness of the natural lens do not come into play, and the anterior and posterior corneal disparities are eliminated, he added.

An intraoperative aberrometer (ORA System, WaveTec/Alcon Laboratories) uses a modified version of the vergence formula and a proprietary algorithm for determining the effective lens position.

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