AIM:To investigate the influence of IOL refractive index(RI)on measurement of straylight following cataract surgery.

METHODS:In this case-control study, 77 eyes of 77 age-related cataract patients who underwent cataract phacoemulsification with posterior chamber aspherical arylic IOL implantation surgery in the Eye Hospital of China Medical University from Aug 2013 to Mar 2014, with a best corrected visual acuity(BCVA)of 0.5 or better, were classified into 3 groups randomly using 3 types of IOL: Tecnis ZCB00 Group(RI=1.47, 22 eyes of 22 subjects); Hoya PY60AD Group(RI=1.52, 24 eyes of 24 subjects); Alcon SN60WF or IQ Group(RI=1.55, 31 eyes of 31 subjects). BCVA, pupil size, astigmatism, axial length, intraocular straylight were measured respectively.

RESULTS:Age, axial length, BCVA, pupil size, astigmatism of the three groups were not significant difference(P>0.05). The straylight of Tecnis, Hoya, IQ group were 1.04±0.15, 1.19±0.14, 1.14±0.18. Straylight levels had significant differences among three groups(F=5.352, P=0.007<0.05). There was no significant correlation between BCVA and straylight value(r=-0.133, P=0.124>0.05).

CONCLUSION:Patients chosen the higher RI IOL may have a higher straylight level after the surgery.