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Variability in angle k and its influence on higher-order aberrations in pseudophakic eyes


Purpose: To observe the variability in angle k in pseudophakic
patients and assess its correlation with optical biometry measurements
and higher-order aberrations (HOAs).
Setting: Hanusch Hospital, Vienna, Austria.
Design: Prospective case series.
Methods: This study included patients who had cataract
surgery 3 months to 1 year before study recruitment.
In all cases, Purkinje meter images were taken. In addition,
partial coherence interferometry measurement (IOLMaster)
of the axial intraocular lens (IOL) position was performed.
In a subgroup of patients, an additional Hartmann-
Shack sensor measurement was taken to assess HOAs
Results: This study comprised 395 eyes of 349 patients. Themean
age of the 210 women and 139 men was 74.1 years G 8.6 (SD)
(range 44 to 91 years). The mean tilt (pupillary axis) and decentration
were 3.9 G 2.3 degrees (range 0.2 to 16.2 degrees) and
0.4G 0.2 mm (range 0.0 to 1.7 mm), respectively. The mean angle
k was 5.2G2.6 degrees (range 0.3 to 13.9 degrees), and themean
orientation of thismodulus was 189.5G53.2 degrees (range 25.3 to
339.7 degrees).
Conclusion: The variability in the angle k was high.

J Cataract Refract Surg 2017; 43:1015–1019 Q 2017 ASCRS and ESCRS
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