Interchangeability between Pentacam and IOLMaster in phakic intraocular lens calculation
Khulood M Sayed1, Alahmady H Alsamman
1Department of Ophthalmology, Sohag Faculty of Medicine, Sohag University, Sohag - Egypt.
Purpose:
To evaluate the agreement and interchangeability between IOLMaster and Pentacam in phakic intraocular lens (IOL) calculations.
Methods:
This was a prospective study involving measurement of the anterior segment parameters anterior chamber depth (ACD), white to white (WTW) line, and average anterior corneal curvature (K-reading) on 108 healthy eyes of 56 consecutive patients. Interdevice agreement and interchangeability in phakic IOL calculations was evaluated.
Results:
Pentacam measured significantly longer ACD measurements (3.54 ± 0.35 mm) than the IOLMaster (3.40 ± 0.37 mm) (p<0.0001); on the other hand, it measured significantly shorter WTW line measurements (11.61 ± 0.44 mm) than the IOLMaster (11.66 ± 0.42 mm) (p = 0.016). No difference was found regarding the average K-readings. For biometry and phakic IOL power calculation, there was no clinically significant difference between the devices, but for phakic IOL diameter calculation the difference was clinically significant.
Conclusions:
There is a good agreement in ACD and K-readings between Pentacam and IOLMaster, making them interchangeable in biometry and phakic IOL power calculation, but they are not interchangeable regarding WTW line measurement; the difference will affect the phakic IOL diameter, which would affect lens safety.
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