[HYBRID MONOVISION]

Abstract

Aim: To evaluate our own results of the use of hybrid monovision technique, in patients after bilateral cataract surgery, where in the dominant eye the monofocal intraocular lens is implanted and in the non-dominant eye the multifocal intraocular lens (IOL) is implanted.

Material and methods: Prospective follow-up of group of 33 patients with bilateral cataract surgery and induced hybrid monovision. In the dominant eye, the hydrophilic monofocal aspheric intraocular lens Auroflex (Aurolab) was implanted, and in the non-dominant eye the hydrophilic multifocal aspheric intraocular lens Seelens (Hanita) was implanted. During the post-operative period, the uncorrected distance visual acuity (UDVA), best-corrected distance visual acuity (CDVA), uncorrected near visual acuity (UNVA), best-corrected near visual acuity (CNVA), and distance-corrected near visual acuity (DCNVA) were established. Further, the monocular contrast sensitivity, subjective satisfaction, and dysfotopsias appearance were examined. The examinations were held 3 and 6 months after the surgery.

Results: In dominant eyes with implanted monofocal lens, UDVA improved from 0.61 ± 0.39 logMAR preoperatively to 0.03 ± 0.14 logMAR at 6 months after the surgery. In non-dominant eyes, with implanted multifocal intraocular lens, UDVA improved from 0.30 ± 0.23 logMAR preoperatively to -0.04 ± 0.06 logMAR. The average binocular UDVA (bUDVA) was -0.07 ± 0.08 logMAR and binocular CDVA (bCDVA) -0.12 ± 0.06. The average UNVA in dominant eyes 6 months after the surgery was 0.62 ± 0.18 logMAR, in non-dominant eyes 0.18 ± 0,15 logMAR, binocularly 0.15 ± 0.11 logMAR. The contrast sensitivity was in the eyes with implanted multifocal IOL slightly worse comparing to the eyes with implanted monofocal lens, albeit only in the space frequency of 6 cycles per degree (CPD) this difference was statistically significant. Subjectively, the presence of dysfotopsia and other problems were very low, the average values of single answers were from 1.3 to 2.1 (on the scale 1 - 5, 1 - no problems and 5 - severe problems). Also, we noticed high percentage of subjective satisfaction with the surgery results (94 %). Six percent of patients wear glasses for near distance as a standard, 42 % of patients wear them occasionally, and 45 % of patients dont use glasses for near distance at all.

Conclusion: The technique of hybrid monovision is effective, safe, and relatively cheap method solving the loss of accommodation in patients after the cataract surgery. This method extends the spectrum of our possibilities how to solve the loss of accommodation in these patients.Key words: hybrid monovision, multifocal intraocular lens, contrast sensitivity.