ฉันรักแปลWhat IOL calculation parameters (A-Constants) should be used in combination with LENSTAR LS 900? A good
question and the most accurate answer would be: “IOL constants that have been optimised to the surgeon’s
individual technique and set of equipment used”.
Still, most users do not have the time, or do not want to take the effort to individualise their constants.
Furthermore those that do take the effort require a set of constants to start with.
The “User Group for Laser Interference Biometry” (ULIB), headed by Prof. Haigis, regularly publishes optimised
IOL constants for IOL Master optical biometer. Studies comparing the measurements of LENSTAR to the ones of
IOL Master showed very good agreement between the two devices1, 2, 3, 4). A study by Rabsilber et al5) as well as
a study by Hoffer et al6) did not only compare the measurements, but also the IOL calculations preformed with
LENSTAR and IOL Master respectively. Neither reported statistically significant differences for any of the
standard formulae (Haigis, Hoffer Q, Holladay I and SRK/T). Hoffer et al6) suggests to use a slightly decreased a0
(approx. 0.05) in the Haigis formula to account for the slightly deeper ACD measurement of LENSTAR.
In summary, it is always recommended to use personalised IOL constants, however initial calculations with
LENSTAR can be accurately performed