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AIM:
To compare
binocular visual quality of bilateral implantation of a toric bifocal
intraocular lens(IOL)or a nontoric bifocal IOL and mix-and-match implantation of a toric bifocal IOL and a nontoric bifocal IOL.<p>
METHODS:
A
cross-sectional study. One hundred and eight
eyes of 54 cases were included from January 2020 to January 2021. All participants were divided into three groups according to preexist
corneal astigmatism and IOL type. In group A,
cornea astigmatism was less than 1.0D in both
eyes of 21 cases and bifocal IOLs were implanted. In group B,
cornea astigmatism was more than 1.0D in both
eyes of 15 cases and toric bifocal IOLs were implanted. In group C, 18 cases of one
eye with
cornea astigmatism less than 1.0D were implanted with bifocal IOLs, and the other
eye with
astigmatism more than 1.0D were implanted with toric bifocal IOLs. Preoperative
intraocular pressure(IOP), monocular uncorrected distance
visual acuity(UDVA), equivalent spherical, postoperative
binocular corrected distance
visual acuity(CDVA), UDVA, uncorrected intermediate
visual acuity(UIVA), uncorrected near
visual acuity(UNVA), residual
astigmatism, defocus curve and
contrast sensitivity were compared among the three groups. Postoperative
questionnaire was conducted to evaluate the visual quality of the three groups.<p>
RESULTS:
There were no significant differences in preoperative UDVA and IOP among the three groups(<i>P</i>>0.05). The postoperative residual
astigmatism in group A was significantly higher than the other two groups(<i>P</i>=0.012, <i>P</i><0.05).
Binocular UDVA of group B and group C were better than those of group A(all <i>P</i><0.05),
binocular UNVA of group B and group C were better than those of group A(all <i>P</i><0.01), but the
binocular UIVA of group A was better than that of group B and group C(all <i>P</i><0.01).
Contrast sensitivity of group A was significantly lower than that of groups B and C in bright
light glare of 6, 12c/d, dark
light of 6, 12, 18c/d and dark
light glare of 1.5, 3, 6, 12, 18c/d(all <i>P</i><0.05). There was no statistical difference in the postoperative visual function
questionnaire among the three groups(<i>P</i>>0.5).<p>
CONCLUSION:
Mix-and-match implantation of a toric bifocal IOL and nontoric bifocal IOL can effectively improve postoperative
binocular visual quality in
cataract patients. Correcting
astigmatism helps improve the
visual contrast sensitivity, however, when
astigmatism is completely corrected, it may result in a loss of intermediate
vision in
patients after
surgery.
