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

Kim, Sang Hyuk; Choi, Si Hwan

doi:2008.49.9.1453

J Korean Ophthalmol Soc > Volume 49(9); 2008 > Article

Original Article

Journal of the Korean Ophthalmological Society 2008;49(9):1453-1460.
DOI: https://doi.org/10.3341/jkos.2008.49.9.1453 Published online September 15, 2008.

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

Sang Hyuk Kim, Si Hwan Choi

Department of Ophthalmology, College of Medicine, Chungnam National University, Daejeon, Korea. shchoi@cnu.ac.kr

혼탁한 친수성 아크릴 인공수정체안의 초음파 생체계측계를 이용한 안축장 측정

김상혁ㆍ최시환

Department of Ophthalmology, College of Medicine, Chungnam National University, Daejeon, Korea

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.

Key Words: Axial lengths;Hydrophilic acryl lens;IOL opacity;Ultrasonic Biometry