Effect of silicone sound speed and intraocular lens thickness on pseudophakic axial length corrections.
We compared the sound speeds of SLM-1/UV (990 M/sec at 35 degrees Celsius [degrees C]), SLM-2/UV (1090 M/sec at 35 degrees C), and Perspex CQ poly(methyl methacrylate)(2658 M/sec at 35 degrees C). Methods are presented to determine the correction of axial length (CAL) factors for axial length measurements made on pseudophakes with AMO PhacoFlex Si-18, Si-26 (SLM-1/UV), and AMO PhacoFlex II SI-20 or SI-30 (SLM-2/UV) silicone intraocular lenses (IOLs). A CAL is required to avoid potential errors with secondary IOL power predictions; CALs, which are strongly dependent on the material sound speed and less so on lens thickness, ranged from -0.65 mm to -1.20 mm for SLM-1/UV silicone IOLs and from -0.35 mm to -0.55 mm for SLM-2/UV silicone IOLs. The sound speeds of IOL materials varied insignificantly between ambient room temperature (23 degrees C) and intraocular temperature (35 degrees C).
Allergan Medical Optics, Irvine, California 92718-2020, USA.
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S
Yang
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A
Lang
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H
Makker
E
E
Zaleski
D016477:Artifacts; D001831:Body Temperature; D005123:Eye / Q000033:anatomy & histology*; D006801:Humans; D007910:Lenses, Intraocular; D008768:Methylmethacrylates; D012826:Silicone Elastomers; D013696:Temperature; D014465:Ultrasonics
D008768:Methylmethacrylates; D012826:Silicone Elastomers