Ultrasonik pakimetri ve scheimpflug sistemi ile kornea kalınlığı ölçümü
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Date
2012
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Abstract
Amaç: Scheimpflug görüntüleme (Pentacam, Oculus, Germany) ve ultrasonik pakimetri (Tomey pachymeter, SP-3000, USA) ile kornea kalınlığı ölçümlerini karşılaştırmak. Gereç ve Yöntem: Refraktif cerrahi için başvurmuş, korneası sağlıklı 200 hastanın 400 gözü retrospektif olarak incelendi. Bu 400 gözün Pentacam ile ultrasonik pakimetri değerleri analiz edildi. Bulgular: Ortalama merkezi kornea kalınlığı Pentacam ile 545,00±1,49 (470-623) ? ve ultrasonik pakimetri ile 546,74±1,58 (467-640) ? idi (p=0,002). Bu iki ölçüm yöntemi arasında pozitif korelasyon vardı (r=0,939, p<0,001). Üç mm parasantral kornea kalınlığı superiorda 656,53±1,91 (565-765) ?, nazalde 627,87±1,86 (543-867) ?, inferiorda 616,62±1,65 (529-716) ? ve temporalde 607,92±1,71 (513-708) ? (p<0,001) idi. Ortalama kornea kalınlığı superiorda en fazla ve temporalde en ince idi (p<0,001). Üç yüz yetmiş sekiz gözde (%94,5) superior kornea en kalın ve 272 gözde (%68) temporal kornea en ince idi (p<0,001). Merkezi ve inferior kornea kalınlıkları arasındaki fark 71,63±0,77 ? (p<0,001, %95 güvenilirlik aralığı: -73,14 ile -70,11 arası) idi. Sonuç: Korneanın ektatik hastalıklarında, merkezi kornea ile inferior kornea arasındaki rölativite değiştiğinden; rutin klinik pratikte sadece merkezi değil, parasantral kornea kalınlığı da değerlendirilmelidir. Sağ ve sol göz arasında kornea kalınlığı asimetrisi de kornea hastalığı şüphesi açısından klinisyeni uyarmalıdır.
Aim: To compare corneal thickness mesurements by Scheimpflug imaging (Pentacam, Oculus, Germany) and ultrasonic pachymetry (Tomey pachymeter, SP-3000, USA). Material and Method: The records of 200 patients with healthy corneas who had applied for refractive surgery were evaluated retrospectively. Pentacam and ultrasonic pachymetry values of these 400 eyes were analyzed. Results: The mean central corneal thickness was 545.00±1.49 (470-623) &#956; by Pentacam and 546.74±1.58 (467-640) &#956; by ultrasonic pachymeter (p=0.002). There was a positive correlation between these two measurement methods (r=0.939, p<0.001). By Pentacam, 3 mm paracentral corneal thickness was 656.53±1.91 (565-765) &#956; superiorly, 627.87±1.86 (543-867) &#956; nasally, 616.62±1.65 (529-716) &#956; inferiorly and 607.92±1.71 (513-708) &#956; temporally (p<0.001). The mean corneal thickness was highest at the superior and thinnest at the temporal side (p<0.001). In 378 eyes (94.5%) superior cornea was the thickest and in 272 eyes (68%) the temporal cornea was the thinnest (p<0.001). The mean difference between corneal thickness measurements at the center and inferiorly was 71.63±0.77 &#956; (p<0.001, 95% confidence interval: from -73.14 to -70.11). Conclusion: Not only central but also paracentral corneal thickness should be evaluated routinely in clinical practice since the relativity of corneal thickness centrally to inferiorly is altered in ectatic diseases of the cornea. The corneal thickness asymmetry between fellow eyes should alert the physician for the suspicion of corneal disease.
Aim: To compare corneal thickness mesurements by Scheimpflug imaging (Pentacam, Oculus, Germany) and ultrasonic pachymetry (Tomey pachymeter, SP-3000, USA). Material and Method: The records of 200 patients with healthy corneas who had applied for refractive surgery were evaluated retrospectively. Pentacam and ultrasonic pachymetry values of these 400 eyes were analyzed. Results: The mean central corneal thickness was 545.00±1.49 (470-623) &#956; by Pentacam and 546.74±1.58 (467-640) &#956; by ultrasonic pachymeter (p=0.002). There was a positive correlation between these two measurement methods (r=0.939, p<0.001). By Pentacam, 3 mm paracentral corneal thickness was 656.53±1.91 (565-765) &#956; superiorly, 627.87±1.86 (543-867) &#956; nasally, 616.62±1.65 (529-716) &#956; inferiorly and 607.92±1.71 (513-708) &#956; temporally (p<0.001). The mean corneal thickness was highest at the superior and thinnest at the temporal side (p<0.001). In 378 eyes (94.5%) superior cornea was the thickest and in 272 eyes (68%) the temporal cornea was the thinnest (p<0.001). The mean difference between corneal thickness measurements at the center and inferiorly was 71.63±0.77 &#956; (p<0.001, 95% confidence interval: from -73.14 to -70.11). Conclusion: Not only central but also paracentral corneal thickness should be evaluated routinely in clinical practice since the relativity of corneal thickness centrally to inferiorly is altered in ectatic diseases of the cornea. The corneal thickness asymmetry between fellow eyes should alert the physician for the suspicion of corneal disease.
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MN Oftalmoloji
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Volume
19
Issue
3
