Aim: To determine whether eyes implanted with the Lenstec KH-3500 ''accommodative'' intraocular lenses (IOLs) have improved subjective and objective focusing performance compared to a standard monofocal IOLs. Methods: 28 participants were implanted monocularly with a KH-3500 ''accommodative'' IOL and 20 controls with a Softec1 IOL. Outcome measures of refraction, visual acuity, subjective amplitude of accommodation, objective accommodative stimulus response curve, aberrometry, and Scheimpflug imaging were taken at ,3 weeks and repeated after 6 months. Conclusions:The objective accommodating effects of the KH-3500 IOL appear to be limited, although the subjective and objective accommodative range is significantly increased compared to control subjects implanted with conventional IOLs. However, this ''accommodative'' ability of the lens appears to have decreased by 6 months post-surgery.