Purpose:

To objectively compare the optical quality and refractive outcomes after implantation of the posterior chamber phakic implantable collamer lens in two different designs (V4c and V5 ICLTM, STAAR Surgical).

Methods:

A retrospective study comprised 31 eyes of 16 patients undergoing EVO+ ICL (V5) implantation, and 37 refractive errors and pupil size-matched eyes of 19 patients undergoing EVO ICL (V4) implantation. We evaluated the postoperative values of OQAS values (OVs), MTF cutoff frequency, Strehl ratio, and objective scattering index (OSI) using an Optical Quality Analysis SystemTM. We compared these variables in addition to the postoperative refractive errors and visual acuity between the two groups.

Results:

The mean OV 100%, OV 20%, OV 9%, MTF cutoff frequency, Strehl ratio, and OSI were 0.95±0.35, 0.66±0.25, 0.42±0.16, 28.94±10.43 cycles/degree, 0.17±0.05, and 1.27±0.75 respectively, 1 month after V5 ICL implantation. We found no statistical significant difference in V4c group except OV 9% and Strehl ratio (p<0.05). Postoperative refractive errors and visual acuity also showed no difference between the groups.

Conclusions:

With an enlargement optic in diameter, newly designed V5 ICL implantation showed a significant visual improvement in scotopic condition and aberration related visual function without altering refractive outcome compared with V4c ICL model. Further study would be required investigating a long term visual performance of V5 ICL model.