Influence of pupil dilation on the Barrett universal II (new generation), Haigis (4th generation), and SRK/T (3rd generation) intraocular lens calculation formulas: a retrospective study

Table 2 Effect of pupil dilation on anterior chamber depth, lens thickness, and white-to-white

Parameters	Mean^a, mm		Mean difference post- minus pre-dilation, mm	Number of eyes
Parameters	Pre-dilation	Post-dilation	Mean difference post- minus pre-dilation, mm	D^b < 0	D = 0	D > 0	P
ACD	3.08 ± 0.40	3.14 ± 0.41	0.06 ± 0.03	0 (0.0%)	0 (0.0%)	150 (100.0%)	< 0.0001
LT	4.57 ± 0.46	4.55 ± 0.41	−0.02 ± 0.01	124 (82.7%)	24 (16.0%)	2 (1.3%)	< 0.0001
WTW	11.87 ± 0.37	11.88 ± 0.38	0.02 ± 0.11	49 (32.7%)	39 (26.0%)	62 (41.3%)	0.16

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