J Korean Ophthalmol Soc.  2013 Feb;54(2):257-264. 10.3341/jkos.2013.54.2.257.

Effects of Axial Length and Vitrectomy on Refractive Error after Cataract Surgery Using SRK/T Formula

Affiliations
  • 1Department of Ophthalmology and Visual Science, The Catholic University of Korea School of Medicine, Seoul, Korea. mskim@catholic.ac.kr

Abstract

PURPOSE
To investigate the error tendency between preoperative target diopter and postoperative manifest refraction in cataract surgery cases and the effect of axial length and vitrectomy on refractive error (RE).
METHODS
We retrospectively studied 90 eyes of 90 patients who underwent cataract surgery. The power of intraocular lens (IOL) was calculated by SRK/T formula. Patients were devided into four groups based on axial length (AXL) and the past history of vitrectomy.
RESULTS
The mean of RE showed no significant difference between groups. But an increasing AXL was associated with increased myopic shift with normal range AXL (< or =24.4 mm) (r = -0.502, p = 0.005) and increased hyperopic shift with long AXL (>24.4 mm) (r = 0.718, p < 0.001). In vitrectomized eyes, it showed no significant refractive shift with both normal range and long AXL.
CONCLUSIONS
When determining IOL power using SRK/T formula in nonvitrectomized eyes, postoperative refractive shift based on axial length should be considered.

Keyword

Axial length; Cataract surgery; Effective lens position; Refractive error; Vitrectomy

MeSH Terms

Cataract
Eye
Humans
Lenses, Intraocular
Reference Values
Refractive Errors
Retrospective Studies
Vitrectomy

Figure

  • Figure 1. Correlation between axial length and refractive error after cataract surgery. Correlation is more significant at 2 month than 1 month after surgery in nonvitrectomized patient (A, B). Vitrectomized patient showed no significant correlation in both normal range (C) and long axial length (D). Refractive error = (Postoperative spherical equivalent) - (Target diopter); r = Pearson correlation coefficient in A and B; r = Spearman rho in C and D.


Reference

References

1. Choi JA, Chung SK, Kim HS. Comparative study of microcoaxial cataract surgery and conventional cataract surgery. J Korean Ophthalmol Soc. 2008; 49:904–10.
Article
2. Szigeti A, Kránitz K, Takacs AI, et al. Comparison of long-term visual outcome and IOL position with a single-optic accommodating IOL After 5.5- or 6.0-mm Femtosecond laser capsulotomy. J Refract Surg. 2012; 28:609–13.
Article
3. He L, Sheehy K, Culbertson W. Femtosecond laser-assisted cataract surgery. Curr Opin Ophthalmol. 2011; 22:43–52.
Article
4. Na JH, Lee HS, Joo CK. The clinical result of acrysof toric intraocular lens implantation. J Korean Ophthalmol Soc. 2009; 50:831–8.
Article
5. Kim SM, Kim CH, Chung ES, Chung TY. Visual outcome and patient satisfaction after implantation of multifocal IOLs: three-month follow-up results. J Korean Ophthalmol Soc. 2012; 53:230–7.
Article
6. Han JH, Oh TH, Kim KS, Chung SK. The prognostic factors that influence in near vision afterAccommodative intraocular lens implantation. J Korean Ophthalmol Soc. 2012; 53:510–5.
7. Kershner RM. Clear corneal cataract surgery and the correction of myopia, hyperopia, and astigmatism. Ophthalmology. 1997; 104:381–9.
Article
8. Kohnen T, Koch MJ. Refractive aspects of cataract surgery. Curr Opin Ophthalmol. 1998; 9:55–9.
Article
9. Maeng HS, Ryu EH, Chung TY, Chung ES. Effects of anterior chamber depth and axial length on refractive error after intraocular lens implantation. J Korean Ophthalmol Soc. 2010; 51:195–202.
Article
10. Olsen T. Prediction of the effective postoperative (intraocular lens) anterior chamber depth. J Cataract Refract Surg. 2006; 32:419–24.
Article
11. Olsen T. Sources of error in intraocular lens power calculation. J Cataract Refract Surg. 1992; 18:125–9.
Article
12. Rose LT, Moshegov CN. Comparison of the Zeiss IOLMaster and applanation A-scan ultrasound: biometry for intraocular lens calculation. Clin Experiment Ophthalmol. 2003; 31:121–4.
Article
13. Connors R 3rd, Boseman P 3rd, Olson RJ. Accuracy and reproducibility of biometry using partial coherence interferometry. J Cataract Refract Surg. 2002; 28:235–8.
Article
14. Eleftheriadis H. IOLMaster biometry: refractive results of 100 consecutive cases. Br J Ophthalmol. 2003; 87:960–3.
Article
15. Hwang JS, Lee JH. Comparison of the IOL master(R) and A-scan ultrasound: refractive results of 96 consecutive cases. J Korean Ophthalmol Soc. 2007; 48:27–32.
16. Lim LH, Lee SY, Ang CL. Factors affecting the predictability of SRK II in patients with normal axial length undergoing phacoemulsification surgery. Singapore Med J. 2009; 50:120–5.
17. Lee YE, Choi KR, Jun RM. Accuracy of intraocular lens power calculations according to the Formulas and anterior chamber depth in short eyes. J Korean Ophthalmol Soc. 2010; 51:1338–44.
Article
18. Kovács I, Ferencz M, Nemes J, et al. Intraocular lens power calculation for combined cataract surgery, vitrectomy and peeling of epiretinal membranes for macular oedema. Acta Ophthalmol Scand. 2007; 85:88–91.
Article
19. Suzuki Y, Sakuraba T, Mizutani H, et al. Postoperative refractive error after simultaneous vitrectomy and cataract surgery. Ophthalmic Surg Lasers. 2000; 31:271–5.
Article
20. Jeoung JW, Chung H, Yu HG. Factors influencing refractive outcomes after combined phacoemulsification and pars plana vitrectomy: results of a prospective study. J Cataract Refract Surg. 2007; 33:108–14.
21. Kim EY, Ahn JH, Lew HM, Yang HS. Effect of vitrectomy on IOL calculation for cataract surgery : study of vitrectomized eyes. J Korean Ophthalmol Soc. 2008; 49:1759–64.
Article
22. Kang S, Chung SK. Postoperative refractive error by using A-scan in cataract surgery after vitrectomy. J Korean Ophthalmol Soc. 2009; 50:1022–6.
Article
23. Shin CJ, Lee JE, Kim JY, Tchah HW. Changes in anterior chamber depth and angle after phacoemulsification measured by anterior segment optical coherence tomography. J Korean Ophthalmol Soc. 2010; 51:353–8.
Article
24. Olsen T. Prediction of the effective postoperative (intraocular lens) anterior chamber depth. J Cataract Refract Surg. 2006; 32:419–24.
Article
25. Olsen T, Corydon L, Gimbel H. Intraocular lens power calculation with an improved anterior chamber depth prediction algorithm. J Cataract Refract Surg. 1995; 21:313–9.
Article
26. Olsen T, Thim K, Corydon L. Theoretical versus SRK I and SRK II calculation of intraocular lens power. J Cataract Refract Surg. 1990; 16:217–25.
Article
27. Olsen T. Calculation of intraocular lens power: a review. Acta Ophthalmol Scand. 2007; 85:472–85.
Article
28. Retzlaff JA, Sanders DR, Kraff MC. Development of the SRK/T intraocular lens implant power calculation formula. J Cataract Refract Surg. 1990; 16:333–40.
Article
29. Holladay JT, Prager TC, Chandler TY, et al. A three-part system for refining intraocular lens power calculations. J Cataract Refract Surg. 1988; 14:17–24.
Article
30. Hoffer KJ. The Hoffer Q formula : a comparison of theoretic and regression formulas. J Cataract Refract Surg. 1993; 19:700–12.
31. HJ Shammas. Intraocular lens power calculations. Thorofare NJ, USA: Slack Inc;2003. p. 41–57.
32. Aristodemou P, Knox Cartwright NE, Sparrow JM, Johnston RL. Formula choice: Hoffer Q, Holladay 1, or SRK/T and refractive outcomes in 8108 eyes after cataract surgery with biometry by partial coherence interferometry. J Cataract Refract Surg. 2011; 37:63–71.
Article
33. Ho JD, Liou SW, Tsai RJ, Tsai CY. Estimation of the effective lens position using a rotating Scheimpflug camera. J Cataract Refract Surg. 2008; 34:2119–27.
Article
34. Shioya M, Ogino N, Shinjo U. Change in postoperative refractive error when vitrectomy is added to intraocular lens implantation. J Cataract Refract Surg. 1997; 23:1217–20.
Article
35. Merriam JC, Zheng L, Merriam JE, et al. The effect of incisions for cataract on corneal curvature. Ophthalmology. 2003; 110:1807–13.
Article
36. Whang WJ, Byun YS, Joo CK. Steep axis incision versus temporal incision in microcoaxial cataract surgery. J Korean Ophthalmol Soc. 2011; 52:29–33.
Article
37. Moon SC, Mohamed T, Fine IH. Comparison of surgically induced astigmatisms after clear corneal incisions of different sizes. Korean J Ophthalmol. 2007; 21:1–5.
Article
38. Jeon S, Na KS, Kim MS. The effect of manipulation of corneal incision on astigmatism during the cataract surgery. J Korean Ophthalmol Soc. 2010; 51:510–5.
Article
39. Behrouz MJ, Kheirkhah A, Hashemian H, Nazari R. Anterior segment parameters: comparison of 1-piece and 3-piece acrylic foldable intraocular lenses. J Cataract Refract Surg. 2010; 36:1650–5.
Article
40. Lee KS, Kim JH, Lee J, et al. Comparison of clinical outcomes between different IOL sizes after microincisional cataract surgery. J Korean Ophthalmol Soc. 2011; 52:1281–5.
Article
41. Iwase T, Tanaka N, Sugiyama K. Postoperative refraction changes in phacoemulsification cataract surgery with implantation of dif- ferent types of intraocular lens. Eur J Ophthalmol. 2008; 18:371–6.
Full Text Links
  • JKOS
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2024 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr