| Astigmatic Correlation between the Automated Refractometry and Dual Scheimpflug Analyzer in Pseudophakic Eyes. |
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Seung Hun Park, In Seok Song, Min Cheol Seong, Hee Yoon Cho, Min Ho Kang |
1Department of Ophthalmology, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea. ocularimmunity@gmail.com
2Department of Ophthalmology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea. |
| 위수정체안에서 자동각막굴절계와 이중샤임플러그에 의한 난시의 상관관계 분석 |
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박승훈1⋅송인석2⋅성민철1⋅조희윤1⋅강민호1 |
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한양대학교 의과대학 한양대학교구리병원 안과학교실1, 한양대학교 의과대학 한양대학교병원 안과학교실2 |
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| Abstract |
PURPOSE
To examine the relationship between the refractive astigmatism by automated refractometry and the corneal astigmatism by a dual Scheimpflug analyzer in pseudophakic eyes. METHODS: Prospectively, 75 patients (100 eyes) were enrolled in the present study. Refractive astigmatism was obtained by automated refraction. Corneal astigmatism was obtained using automated keratometry (ARK-530A®) and dual Scheimpflug scanning analysis (Galilei G4®). All refractive values were converted to the power vector components J0 and J45 for comparison and regression analysis of refractive versus corneal astigmatism. Bland-Altman plots were created to estimate the agreement between measurements. RESULTS: The average astigmatism from each measurement was -1.11 ± 1.44 D (refractive astigmatism from automated refraction), -0.77 ± 1.06 D (corneal astigmatism from automated keratometry), -0.93 ± 1.02 D (simulated K from Galilei G4®), and -1.11 ± 1.48 D (total corneal power from Galilei G4®). Refractive J0 and keratometric J0 were significantly correlated (r = 0.557, p ≤ 0.001), as well as the corresponding J45 values (r = 0.655, p = 0.025). Refractive astigmatism and total corneal power components were also significantly correlated (J0: r = 0.618, p ≤ 0.001; J45: r = 0.608, p = 0.04). In the Bland-Altman plots, keratometric J0 and total corneal power J0 showed the best agreement. CONCLUSIONS: The accuracy of measurements for corneal refraction and astigmatism in pseudophakic eyes is higher using the dual Scheimpflug analyzer, especially for total corneal power. This value of astigmatism can take into account the refractive astigmatism of pseudophakic eyes and can be used in evaluating postoperative corneal astigmatism. |
| Key Words:
Dual Scheimpflug analyzer;Galilei G4®;Pseudophakia;Refractive and keratometric astigmatism |
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