J Korean Ophthalmol Soc.  2008 Sep;49(9):1453-1460.

Determine a Proper Axial Length by Ultrasonic Biometry in Opaque Hydrophilic Acrylic Intraocular Lens

• Kim SH
• Choi SH

Abstract

PURPOSE
To investigate the accuracy of measuring ultrasonic axial lengths using A-scan (Ocuscan(R), Alcon, USA) on opaque intraocular lenses after hydrophilic lens (ACRL-160(R), Ophthalmed, USA) implantation.
METHODS
We measured axial length through ultrasonic biometry prior to intraocular lens exchange. Twelve eyes of 14 patients who had intraocular lens opacity following hydrophilic acryl lens implantation were examined in a clinical study. We compared pre-cataract operative axial lengths to pre-IOL exchange axial lengths. The pre-IOL exchange axial lengths were measured in aphakic and pseudophakic modes. In the pseudophakic mode, the ultrasound velocity through an IOL was set at a rate ranging between 1,500 m/sec to 2,200 m/sec.
RESULTS
The pre-IOL exchange axial lengths in the pseudophakic mode at the rate of 1,600 m/sec in lens velocity were the closest to pre-cataract operative values (p=0.88).
CONCLUSIONS
When pre-cataract operative axial length is known with a hydrophilic acrylic intraocular lens, previous values may be used for IOL exchange of an opacity patient. If not, however, the closest values to pre-cataract operative axial lengths may be obtained by setting the velocity in the pseudophakic mode to a lens velocity rate of 1,600 m/sec.

Keyword

Axial lengths; Hydrophilic acryl lens; IOL opacity; Ultrasonic Biometry

MeSH Terms

Biometry
Eye
Humans
Lenses, Intraocular
Ultrasonics

Figure

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  Figure 1. Slit lamp photographs of opaque hydrophilic acrylic intraocular lens.

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  Figure 2 . (A) Ultrasonic analyzer 5601A (Panametric, USA) measures for the measurement of ultrasonic velocity in hydrophilic acrylic lens (ACRL-C160®, Ophthalmed, USA). (B) Result of the measurement: Ultrasonic velocity shows 2008 m/sec.

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  Figure 3. The result of axial length measurement at pre-cataract operation and pre-IOL exchange (aphakic/pseudophakic mode). (A)=aphakic mode; (B)=pseudophakic mode (lens velocity, 1,600 m/sec); (C)=pseudophakic mode (lens velocity, 2,000 m/sec); (D)=pseudophakic mode (lens velocity, 2,200 m/sec).

Reference

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