A Clinical Study of 3M Multifocal Intraocular Lens Implant

ABSTRACT

Recently, it has been widely recognized that the newly developed multi focal intraocular lens provides good near and far vision. Therefore, among 70 eyes who underwent 3M multifocal intraocular lens insertion procedure at our hospital from July 1989 to may 1990, 50 eyes that could be closely followed up for at least 3 months postoperatively were chosen as our study subjects. After careful analytical review of data such as postoperative near and far vision, refractory power, spherical equivalent of diopter of spectacles needed for correction of vision, change of vision according to size of pupil as well as relationship between central location of intraocular lens(IOL) and vision, and multifocusing ability of IOL, we have attained the following results. 1. 36(72.0%) males and 14 females(28.0%) have received multifocal IOL. According to age, 16 eyes(32.0%) were in their 40's, comprising the greatest number, followed by those in the 50's(24.0%) and 60's(24.0%). 2. Postoperatively, 23 eyes(46.0%) have attained emmetropia. 12 eyes(24.0%) were hyperopic, and 15 eyes(30.0%) were myopic. Spherical equivalent of corrected spectacles was -0.35D. The number of eyes attaining corrected vision over 1.0 was 36(72.0%),44 eyes over 0.5(88.0%), and 6 eyes less than 0.4(12.0%). 3. The number of near vision J1 with corrected vision over 1.0 were 33 eyes(66.0%), greater than J2 were 36(72.0%), and in the case of vision of 0.9-0.8 J1 and J2 were 2 eyes(4.0%) and 3 eyes(6.0%), respectively; vision of 0.7-0.5 J2 was 1 eye(2.0%), J3 were 2 eyes(4.0%). In vision less than 0.4, J3 and less than J3 were 3 eyes(6.0%) in each cases. 4. Corrected near vision attained by additional diopter in 15 eyes that have a near vision of less than J2 are as follow 7 eyes of J1(14.0%), 4 eyes of J2(8.0%) 2 eyes of J3(4.0%) and 2 eyes of less than J3(4.0%). Average additional diopter required to obtain J1 was +0.64D. 5. In the group that has corrected vision over 1.0, the number of eyes that had matched center of IOL and center of pupil was 17(34.0%), number of eyes that has a deviation of 0.5 mm was 6(12.0%), 8 eyes with a deviation of 1.0 mm(16.0%), 5 eyes with a deviation of 1.5 mm(10.0%); but, none have affected vision. 6. Change of vision according to the size of pupil was measured. In the case of corrected vision over 1.0, pupil size of 2.0-4.0 mm and dilated pupil size over 5.0 mm occurred in 36 eyes in each case, and a constricted pupil size less than 2.0 mm occurred 35 eyes with no vision change observed. 7. In the case of corrected vision over 1.0, additional use of lens from +1.0D to -3.0D has not affected vision when maintained at a level of over 0.8 but use of any lens out of this range has dramatically decreased vision. 8. After inserting vultifocal IOL, complaints of diplopia, glare, dizziness and seeing rings were observed in 10 eyes(20.0%); but, 5 months later symptoms had disappeared in all cases.