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Accutome A-Scan Plus User’s Guide
*Note: This procedure uses the A-Constant as the IOL
constant. You can enter the ACD or SF as the first
constant entered also. When entering a lens
constant, the three constants for the Hoffer, Holladay
and SRK/T are calculated if they are all empty. At
the same time the Haigis constants a0, a1 and a2
are calculated. a1 is always 0.4, and a2 is always
0.1 unless specified by the user as a result of triple
optimization. a0 is the IOL factor, a1 is the measured
ACD factor, and a2 is the is the axial length factor for
determining the post operative ACD of the IOL.
If you have more than one constant for your lens,
such as an A-Constant and a personalized SF, enter
the non personalized A-Constant first, then overwrite
the calculated SF with your personalized SF.
Personalized constants should only be used with the
formula they were derived from.
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