Skip to main content
PMC home page
The British Journal of Ophthalmology logoLink to The British Journal of Ophthalmology
. 1998 Apr;82(4):419–422. doi: 10.1136/bjo.82.4.419

Comparison of decentration and tilt between one piece and three piece polymethyl methacrylate intraocular lenses

K Hayashi 1, H Hayashi 1, F Nakao 1, F Hayashi 1
PMCID: PMC1722563  PMID: 9640193

Abstract

BACKGROUND—The extent of the decentration and tilt was prospectively compared between one piece polymethyl methacrylate (PMMA) and three piece PMMA intraocular lenses (IOLs) which were implanted in the capsular bag after performing continuous curvilinear capsulorhexis.
METHODS—91 patients underwent a one piece PMMA IOL implantation in one eye as well as the implantation of the three piece PMMA IOL with polyvinylidene fluoride loops in the opposite eye. The length of the lens decentration and the angle of the tilt were quantitated using the anterior eye segment analysis system (EAS-1000) at 1 week as well as 1, 3, and 6 months postoperatively.
RESULTS—The mean length of the decentration in the one piece IOL was smaller than that in the three piece IOL at 1 week (p=0.0092), 1 month (p=0.0044), 3 months (p=0.0069), and 6 months (p=0.0010) postoperatively. However, no significant difference was found in the degree of the tilt between the two types of IOLs throughout the observation periods.
CONCLUSION—These results clarified that the one piece PMMA IOL with rigid PMMA haptics implanted in the capsular bag provides a better centration than the three piece PMMA IOL with flexible haptics, whereas the tilt was the same between the two types of IOLs.

 Keywords: intraocular lens; decentration; tilt; continuous curvilinear capsulorhexis

Full Text

The Full Text of this article is available as a PDF (97.7 KB).

Figure 1  .

Figure 1  

Open in a new tab

Schema of the one piece and three piece intraocular lenses (IOLs) used in this study.

Figure 2  .

Figure 2  

Open in a new tab

Comparison of the decentration between the one piece and three piece PMMA IOLs. The mean length of the decentration in the one piece PMMA IOL was significantly smaller than that in the three piece PMMA IOL at 1 week (p=0.0092), 1 month (p=0.0044), 3 months (p=0.0069), and 6 months (p=0.0010) after surgery. *Statistically significant.

Figure 3  .

Figure 3  

Open in a new tab

Comparison of the tilt between the one piece and three piece PMMA IOLs. No statistically significant difference was observed in the tilt angles between the one and three piece IOLs throughout the observation periods. *No statistical significance.

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Baez K. A., Orengo S., Gandham S., Spaeth G. L. Intraobserver and interobserver reproducibility of the Nidek EAS-1000 Anterior Eye Segment Analysis System. Ophthalmic Surg. 1992 Jun;23(6):426–428. [PubMed] [Google Scholar]
  2. Davison J. A. Analysis of capsular bag defects and intraocular lens positions for consistent centration. J Cataract Refract Surg. 1986 Mar;12(2):124–129. doi: 10.1016/s0886-3350(86)80026-8. [DOI] [PubMed] [Google Scholar]
  3. Gimbel H. V. Divide and conquer nucleofractis phacoemulsification: development and variations. J Cataract Refract Surg. 1991 May;17(3):281–291. doi: 10.1016/s0886-3350(13)80824-3. [DOI] [PubMed] [Google Scholar]
  4. Gimbel H. V., Neuhann T. Development, advantages, and methods of the continuous circular capsulorhexis technique. J Cataract Refract Surg. 1990 Jan;16(1):31–37. doi: 10.1016/s0886-3350(13)80870-x. [DOI] [PubMed] [Google Scholar]
  5. Hansen S. O., Crandall A. S., Olson R. J. Progressive constriction of the anterior capsular opening following intact capsulorhexis. J Cataract Refract Surg. 1993 Jan;19(1):77–82. doi: 10.1016/s0886-3350(13)80287-8. [DOI] [PubMed] [Google Scholar]
  6. Hansen S. O., Solomon K. D., McKnight G. T., Wilbrandt T. H., Gwin T. D., O'Morchoe D. J., Tetz M. R., Apple D. J. Posterior capsular opacification and intraocular lens decentration. Part I: Comparison of various posterior chamber lens designs implanted in the rabbit model. J Cataract Refract Surg. 1988 Nov;14(6):605–613. doi: 10.1016/s0886-3350(88)80027-0. [DOI] [PubMed] [Google Scholar]
  7. Hansen S. O., Tetz M. R., Solomon K. D., Borup M. D., Brems R. N., O'Morchoe D. J., Bouhaddou O., Apple D. J. Decentration of flexible loop posterior chamber intraocular lenses in a series of 222 postmortem eyes. Ophthalmology. 1988 Mar;95(3):344–349. doi: 10.1016/s0161-6420(88)33178-7. [DOI] [PubMed] [Google Scholar]
  8. Hayashi K., Harada M., Hayashi H., Nakao F., Hayashi F. Decentration and tilt of polymethyl methacrylate, silicone, and acrylic soft intraocular lenses. Ophthalmology. 1997 May;104(5):793–798. doi: 10.1016/s0161-6420(97)30231-0. [DOI] [PubMed] [Google Scholar]
  9. Hayashi K., Hayashi H., Nakao F., Hayashi F. The correlation between incision size and corneal shape changes in sutureless cataract surgery. Ophthalmology. 1995 Apr;102(4):550–556. doi: 10.1016/s0161-6420(95)30983-9. [DOI] [PubMed] [Google Scholar]
  10. Hirokane K., Kimura W., Kimura T., Sawada T., Ohte A. [Reproducibility of measurement of intraocular lens location in situ with an anterior eye segment analysis system]. Nippon Ganka Gakkai Zasshi. 1996 Mar;100(3):240–245. [PubMed] [Google Scholar]
  11. Kimura W., Kimura T., Sawada T., Kikuchi T., Nagai H., Yamada Y. Comparison of shape recovery ratios of single-piece poly(methyl methacrylate) intraocular lens haptics. J Cataract Refract Surg. 1993 Sep;19(5):635–639. doi: 10.1016/s0886-3350(13)80015-6. [DOI] [PubMed] [Google Scholar]
  12. Leaming D. V. Practice styles and preferences of ASCRS members--1985 survey. J Cataract Refract Surg. 1986 Jul;12(4):380–384. doi: 10.1016/s0886-3350(86)80100-6. [DOI] [PubMed] [Google Scholar]
  13. Leaming D. V. Practice styles and preferences of ASCRS members--1994 survey. J Cataract Refract Surg. 1995 Jul;21(4):378–385. doi: 10.1016/s0886-3350(13)80524-x. [DOI] [PubMed] [Google Scholar]
  14. Legler U. F., Assia E. I., Castaneda V. E., Hoggatt J. P., Apple D. J. Prospective experimental study of factors related to posterior chamber intraocular lens decentration. J Cataract Refract Surg. 1992 Sep;18(5):449–455. doi: 10.1016/s0886-3350(13)80097-1. [DOI] [PubMed] [Google Scholar]
  15. Nishi O., Nishi K. Intraocular lens encapsulation by shrinkage of the capsulorhexis opening. J Cataract Refract Surg. 1993 Jul;19(4):544–545. doi: 10.1016/s0886-3350(13)80621-9. [DOI] [PubMed] [Google Scholar]
  16. Ohmi S., Uenoyama K. Experimental evaluation of posterior capsule opacification and intraocular lens decentration: comparison of intraocular lenses of 12.5 mm and 14.0 mm diameter. J Cataract Refract Surg. 1993 May;19(3):348–351. doi: 10.1016/s0886-3350(13)80304-5. [DOI] [PubMed] [Google Scholar]
  17. Oshika T., Masuda K., Hayashi F., Majima Y., Leaming D. V. Current trends in cataract and refractive surgery in Japan--1994 survey. Jpn J Ophthalmol. 1995;39(3):265–273. [PubMed] [Google Scholar]
  18. Singer J. A. Frown incision for minimizing induced astigmatism after small incision cataract surgery with rigid optic intraocular lens implantation. J Cataract Refract Surg. 1991;17 (Suppl):677–688. doi: 10.1016/s0886-3350(13)80683-9. [DOI] [PubMed] [Google Scholar]
  19. Tetz M. R., O'Morchoe D. J., Gwin T. D., Wilbrandt T. H., Solomon K. D., Hansen S. O., Apple D. J. Posterior capsular opacification and intraocular lens decentration. Part II: Experimental findings on a prototype circular intraocular lens design. J Cataract Refract Surg. 1988 Nov;14(6):614–623. doi: 10.1016/s0886-3350(88)80028-2. [DOI] [PubMed] [Google Scholar]

Articles from The British Journal of Ophthalmology are provided here courtesy of BMJ Publishing Group

RESOURCES