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Jung, Rho, and Kim: The Keratometric and Refractive Value Change According to Trephine Size Difference after Keratoplasty in Keratoconus
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(7): 947-952.

Published online: 13 July 2012

DOI: https://doi.org/10.3341/jkos.2012.53.7.947

The Keratometric and Refractive Value Change According to Trephine Size Difference after Keratoplasty in Keratoconus

Su Kyung Jung, MD, Chang Rae Rho, MD, Man Soo Kim, MD, PhD

Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.

Address reprint requests to Man Soo Kim, MD, PhD. Department of Ophthalmology, Seoul St. Mary's Hospital, The Catholic University of Korea, #222 Banpo-daero, Seocho-gu, Seoul 137-701, Korea. Tel: 82-2-2258-2846, Fax: 82-2-599-7405, mskim@catholic.ac.kr

Received 25 May 2011       Accepted 12 May 2012

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

To investigate mean keratometric and refractive value after penetrating keratoplasty according to the difference between donor and recipient cornea size.

Methods

In a retrospective study, Keratoconus patients who underwent penetrating keratoplasty for keratoconus from January 2005 to July 2008 were examined. Preoperatively, axial length was measured using applanation ultrasonography and anterior chamber depth, white to white diameter were also measured using the corneal topography. The trephine size of donor and recipient during the surgery were recorded. Preoperatively, 6, 12, and 24 months postoperatively refraction and keratometric value were evaluated in groups divided according to corneal trephine size difference.

Results

Among the 41 eyes of 41 patients, there was a mean age at transplant of 26.4 years. After surgery, the decrease of anterior chamber depth could contribute to the decrease of myopic change. However, the differences between donor and recipient cornea size do not have a significant affect on postoperative keratometric or refractive value.

Conclusions

There is no significant difference between the postoperative keratometric value and the corneal trephine size difference in keratoconus patients.

Keywords: Keratoconus, Keratometry, Penetrating keratoplasty, Refraction

Figures and Tables

Figure 1
The keratometric value changes of groups divided according to the trephine size difference at 6, 12 and 24 months postoperatively after conventional penetrating keratoplasty. There was no significant keratometric value difference among these groups at postoperative 6 months, 12 months and 24 months.
jkos-53-947-g001
Figure 2
The spherical equivalent changes of groups divided according to the trephine size difference at 6, 12 and 24 months postoperatively after conventional penetrating keratoplasty. There was no significant refractive value difference among these groups at postoperative 6 months, 12 months and 24 months.
jkos-53-947-g002
Table 1
Demographic data of patients
jkos-53-947-i001

HM = hand motion; FC = finger count.

Table 2
Postoperative data of patients according to the axial length and corneal trephine size difference
jkos-53-947-i002

ACD = anterior chamber depth; K Avg = average of Keratometry value; SE = spherical equivalent.

*The diameter of donor cornea is 0.25 mm larger than the recipient's; †Calculated by using the Chi-square test; ‡Calculated by using the t-test.

Table 3
Linear regression analysis results for predictors of the amount of postoperative keratometric value
jkos-53-947-i003

*Calculated using the Spearman's Rho test.

Table 4
Multiple linear regression analysis results for predictors of the amount of postoperative keratometric value at postoperative 24 months
jkos-53-947-i004

*Calculated using multiple regression analysis.

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