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Chang and Kim: Long-Term Results of Three Cases of Radial Keratotomy
Original Article

J Korean Ophthalmol Soc 2015;56(1):124-126.

Published online: 6 September 2015

DOI: https://doi.org/10.3341/jkos.2015.56.1.124

Long-Term Results of Three Cases of Radial Keratotomy

Bi Chang, MD, Jae Woo Kim, MD, PhD

Department of Ophthalmology, Catholic University of Daegu School of Medicine, Daegu, Korea

Address reprint requests to Jae Woo Kim, MD, PhD, Department of Ophthalmology, Daegu Catholic University Medical Center, #33 Duryugongwon-ro 17-gil, Nam-gu, Daegu 705-718, Korea, Tel: 82-53-650-4728, Fax: 82-53-627-0133 E-mail: jwkim@cu.ac.kr

Received 21 October 201427 October 2014       Accepted 24 November 2014

Copyright © 2015 Korean Ophthalmological Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To report the long-term results concerning refractive changes after radial keratotomy in 6 eyes of 3 patients.

Case summary

We observed 3 patients who underwent radial keratotomy over 25 years previously. The positive effect of this surgery on the correction of refractive error decreased with increasing post-surgery time and myopic refractive errors accom-panying astigmatism recurred. On average, refractive errors improved to 3.375 diopter (D) and corneal power improved to 2.954 D; in all cases, uncorrected visual acuities were not significantly improved.

Conclusions

The effect of radial keratotomy on the correction of refractive errors decreased with time due to regression; myopic refractive errors recurred in the long-term.

Keywords: Myopia, Radial keratotomy, Refractive error, Regression

References

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2. Sato T, Akiyama K, Shibata H. A new surgical approach to myopia. Am J Ophthalmol. 1953; 36:823–9.
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3. Fyodorov SN, Durnev VV. Operation of dosaged dissection of corneal circular ligament in cases of myopia of mild degree. Ann Ophthalmol. 1979; 11:1885–90.
4. Kim JH. Clinical experiences of radial keratotomy for reduction of myopia. J Korean Ophthalmol Soc. 1983; 24:735–44.
5. Kim JH, Kim JK, Ham TS. A prospective clinical study of radial keratotomy: Report 2. J Korean Ophthalmol Soc. 1986; 27:9–29.
6. Lee EJ, Han JC, Kee CW. A case of cataract surgery after radial keratotomy. J Korean Ophthalmol Soc. 2014; 55:1089–92.
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7. Waring GO 3rd, Lynn MJ, McDonnell PJ. Results of the pro-spective evaluation of radial keratotomy (PERK) study 10 years after surgery. Arch Ophthalmol. 1994; 112:1298–308.
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8. Charpentier DY, Garcia P, Grunewald F. . Refractive results of radial keratotomy after 10 years. J Refract Surg. 1998; 14:646–8.
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Table 1.
Patient demographics, incision depth and results of uncorrected visual acuity
Case (age/sex) Eye Duration (years) Depth (μ m)
 Pre-operative visual acuity ∗ Post-operative visual acuity
Center Re-deepening
1 49/M OD 29 525 570 0.06 0.1
  OS 29 530 580 0.04 0.1
2 49/F OD 28 520 550 0.1 0.3
  OS 28 500 530 0.1 0.4
3 48/F OD 25 530 580 0.2 0.1
  OS 25 520 550 0.15 0.1

∗ Uncorrected visual acuity at last follow-up.

Table 2.
Changes of corneal power and refractive error after radial keratotomy
Case (eye) Pre-operative K
 Post-operative K
 Pre-operative refractive error Post-operative refractive error
H V H V
1 OD 43.0 43.6 38.5 39.5 -9.0 D sph = -1.0 D cyl × 180 o -3.50 D sph = -0.5 D cyl × 40 o
OS 43.0 43.8 39.0 39.0 -8.0 D sph = -1.5 D cyl × 180 o -3.75 D sph = -1.5 D cyl × 130 o
2 OD 43.0 43.8 41.95 42.0 -4.0 D sph = -2.5 D cyl × 180 o +0.25 D sph = -2.5 D cyl × 84 o
OS 43.2 44.2 41.7 40.9 -5.0 D sph = -1.0 D cyl × 180 o +0.50 D sph = -1.25 D cyl × 53 o
3 OD 43.0 43.4 40.3 41.4 -4.0 D sph -2.75 D sph = -1.5 D cyl × 54 o
OS 44.0 44.1 41.3 41.9 -7.50 D sph = -0.5 D cyl × 180 o -6.0 D sph = -0.75 D cyl × 137 o

K = keratometry; H = horizontal; V = vertical.

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