Visual quality of juvenile myopes wearing multifocal soft contact lenses.

BACKGROUND

It is unclear whether multifocal soft contact lenses (MFSCLs) affect visual quality when they are used for myopia control in juvenile myopes. The aim of this study was, therefore, to investigate the effect of MFSCLs on visual quality among juvenile myopia subjects.

METHODS

In a prospective, intervention study, thirty-three juvenile myopes were enrolled. Visual perception was assessed by a quality of vision (QoV) questionnaire with spectacles at baseline and after 1 month of MFSCL wear. At the one-month visit, the high (96%) contrast distance visual acuity (distance HCVA) and low (10%) contrast distance visual acuity (distance LCVA) were measured with single vision spectacle lenses, single vision soft contact lenses (SVSCLs) and MFSCLs in a random order. Wavefront aberrations were measured with SVSCLs, with MFSCLs, and without any correction.

RESULTS

Neither distance HCVA ( > 0.05) nor distance LCVA ( > 0.05) revealed any significant difference between MFSCLs, SVSCLs and single vision spectacle lenses. The overall score (the sum of ten symptoms) of the QoV questionnaire did not show a statistically significant difference between spectacles at baseline and after 1 month of MFSCL wear ( = 0.357). The results showed that the frequency ( < 0.001), severity ( = 0.001) and bothersome degree ( = 0.016) of halos were significantly worse when wearing MFSCLs than when wearing single vision spectacle lenses. In contrast, the bothersome degree caused by focusing difficulty ( = 0.046) and the frequency of difficulty in judging distance or depth perception ( = 0.046) were better when wearing MFSCLs than when wearing single vision spectacle lenses. Compared with the naked eye, MFSCLs increased the total aberrations ( < 0.001), higher-order aberrations ( < 0.001), trefoil ( = 0.023), coma aberrations ( < 0.001) and spherical aberrations (SA) ( < 0.001). Compared with the SVSCLs, MFSCLs increased the total aberrations ( < 0.001), higher-order aberrations ( < 0.001), coma aberrations ( < 0.001) and SA ( < 0.001). The direction of SA was more positive ( < 0.001) with the MFSCLs and more negative ( = 0.001) with the SVSCLs compared with the naked eye.

CONCLUSIONS

Wearing MFSCLs can provide satisfactory corrected visual acuity (both distance HCVA and distance LCVA). Although the lenses increased the aberrations, such as total aberrations and higher-order aberrations, there were few adverse effects on the distance HCVA, distance LCVA and visual perception after 1 month of MFSCL use.

TRIAL REGISTRATION

Chinese Clinical Trial Registry: ChiCTR-OOC-17012103. Registered 23 July 2017, http://www.chictr.org.cn/usercenter.aspx.