[Study of binocular function in early stage after implantation of multifocal intraocular lens].

OBJECTIVE

To evaluate binocular function in the early stage after implantation of multifocal intraocular lens.

METHODS

Three weeks postoperatively, simultaneous perception, fusion, near and far-distance stereoacuity, visual acuity and visual symptoms were observed in 31 cases (46 eyes) with multifocal intraocular lens implantation (MIOL) [MIOL group, in which 16 cases with unilateral implantation (Ms) and 15 cases with bilateral implantation (Md)] and 32 cases (47 eyes) with single-focal intraocular lens implantation (SIOL) [SIOL group, in which 17 cases with unilateral implantation (Ss) and 15 cases with bilateral implantation (Sd)].

RESULTS

All patients obtained simultaneous perception and fusion sense, there was no significantly statistical difference between these two group (P > 0.05). Foveal far-distance stereoacuity was established in 38.7% cases among MIOL group (12/31) and 40.6% in SIOL group (13/32), with no statistically significant difference between these two groups (P > 0.05). Foveal near-distance stereoacuity was established in 41.9% MIOL cases (13/31) and in 15.6% SIOL group (5/32), the difference was statistically significant (P < 0.05). Foveal near and far-distance stereoacuity of either Ms and Md or Ss and Sd revealed no significantly statistical difference (P > 0.05). Two patients (6.5%) with MIOL in only one eye complained glare at night, others were satisfied. The stereopsis visual performance such as the quality of vision during eating, up-and-down stairs was improved in MIOL group [80.6% (25/31)] and in SIOL group [56.2% (18/32)], the difference was statistically significant (P < 0.05).

CONCLUSIONS

There is a complete recovery of binocular vision in the early post-operative stage of MIOL implantation as compared with the normal value of aged people. Foveal near and far-distance stereoacuity after bilateral and unilateral implantation of either MIOL or SIOL revealed no statistically significant difference. Foveal near-distance stereopsis acuity of MIOL group was improved more quickly than that of SIOL group. MIOL has distinct advantage in providing whole-distance visual acuity and stereoacuity.