| Accuracy of Corneal Thickness Measurement with Ultrasound Pachymeter in Thin Corneas. |
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Jun Heon Kim, Jong Suk Song, Hyo Myung Kim, Hai Ryun Jung |
1Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea. hyomkim@ns.kumc.or.kr
2Department of Ophthalmology, Gachon Medical School, Incheon, Korea. |
| 얇은 각막에서 초음파 각막두께측정계의 정확도 |
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김준헌 ( Jun Heon Kim ) , 송종석 ( Jong Suk Song ) , 김효명 ( Hyo Myung Kim ) , 정해륜 ( Hai Ryun Jung ) |
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| Abstract |
PURPOSE
Accurate assessment of corneal thickness is important in order to prevent iatrogenic corneal ectasia after laser in situ keratomileusis (LASIK). More accurate measurement is needed in LASIK enhancement because the cornea becomes thin after previous refractive surgery. We evaluated the reliability of corneal thickness measurement with ultrasound pachymeter (USP) in the thin corneas. METHODS: The corneal thickness was measured in the 22 eyes of 11 rabbits. The corneal flap was made with an Automated Corneal Shaper microkeratome (Bausch and Lomb, USA) with 130 micro meter plate and the flap was removed in order to make the cornea thin. Residual stromal bed (RSB) thickness was measured with USP and thickness gauge, and the two measurements were compared. RESULTS: Mean corneal thickness was 404.69 +/- 11.01 micro meter with USP and 133.23 +/- 15.66 micro meter with thickness gauge. RSB thickness measured with thickness gauge was 269.05 +/- 24.19 micro meter and this was not significantly different from the expected RSB thickness, although RSB thickness measured with USP was 388.14 +/- 10.17 micro meter, which was significantly different from the expected RSB thickness (p=0.00). CONCLUSIONS: In the thin corneas, corneal thickness measurement with ultrasound pachymeter is not reliable. |
| Key Words:
Residual stromal bed thickness;Thin cornea;Ultrasound pachymeter |
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