This article is more than 5 years old. Information may no longer be current.
OVDs influenced IOL power from intraoperative aberrometry insignificantly
CHICAGO — Aphakic power calculation based on intraoperative aberrometry was lower when viscosurgical devices were used instead of balanced saline solution, but not significantly so, according to study results presented here.
At the American Academy of Ophthalmology meeting, Samuel Masket, MD, compared intraoperative aberrometry measurement (ORA, WaveTec Vision) with balanced saline solution to measurements taken with ophthalmic viscosurgical devices (OVDs).
Samuel Masket
“The implications are that ORA with OVDs will give a variable lower-power IOL,” Masket said. “The reason for that is that the path of light is slowed going through the OVD, owing to the index of refraction. Because the path of light is slowed, the WaveTec device assumes the eye is longer and suggests a lower-power lens.”
Masket and colleagues calculated IOL power for 120 eyes. The OVDs used were ProVisc (Alcon), DisCoVisc (Alcon), Healon (Abbott Medical Optics), Healon GV (Abbott Medical Optics), Amvisc (Bausch + Lomb) and Amvisc Plus (Bausch + Lomb). Each was used in 20 eyes across six groups.
ORA readings were taken after filling the eye with balanced saline solution. Immediately afterward, the balanced saline solution was replaced with an OVD and ORA readings were repeated. IOL power was selected from the ORA measurement with balanced saline solution.
Masket and colleagues compared suggested IOL power between ORA readings taken with balanced saline solution and those taken with OVDs.
Refraction measured when Healon, ProVisc and Amvisc were used differed insignificantly from readings taken when balanced saline solution was used, according to Masket.
“The surgeon may take comfort in using those agents instead of balanced saline solution,” he said. “DisCoVisc and Amvisc Plus are to be avoided for this, and Healon GV is borderline.”
Disclosure: Masket has financial relationships with Accutome, Alcon Laboratories, Haag-Streit, Morcher GmbH, MST Surgical, Ocular Theraputix, PowerVision and WaveTec Vision Systems.