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 |
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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 |
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