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S. Fukuda, K. Kawana, Y. Yasuno, T. Oshika; Evaluation of Clear Corneal Incision of Cataract Surgery Using Three Dimensional Corneal and Anterior Segment Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2008;49(13):5661.
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To evaluate the structure of clear corneal incision (CCI) and the effect of stromal hydration in cataract surgery using three-dimensional cornea and anterior segment optical coherence tomography (3D CAS-OCT).
A total 31 eyes from 22 patients who had undergone standard phaco emulsification using 2.4-mm steel blade was evaluated. The CCI was assessed using 3D CAS-OCT at 1 day, 1 week, and 2 week after surgery. The mean age of the participant was 71.6 ± 12.1 years old (mean ± standard deviation). The wounds of 22 eyes were hydrated and checked for water-tightness. The 9 eyes did not receive stromal hydration. The 3D CAS-OCT prototype was built by Computational Optics Group at the University of Tsukuba and Tomey Corporation (Nagoya, Japan). Using a 1.3-µm light source, the CAS-OCT can create 3D images of the anterior segment in 3.3 seconds. The measurement parameters were the length and width of CCI, the length between angle and incision, and corneal thickness at CCI.
The length and width of CCI were 2.57 ± 0.09 mm and 1.85 ± 0.22 mm, respectively. The length between angle and incision was 2.67 ± 0.48 mm. The corneal thickness at CCI with stromal hydration were 977 ± 114, 897 ± 60, and 798 ± 63 µm at 1 day, 1 week, and 2 week after surgery, respectively. The corneal thickness at CCI without stromal hydration were 837 ± 73, 783 ± 70, and 748 ± 69 µm at 1 day, 1 week, and 2 week after surgery, respectively. A statistically significant difference in the thickness of CCI was noted between stromal hydration group and no hydration group at 1day and 1 week after surgery (P<0.005, unpaired t test). There was no significant between-group difference at 2 week after surgery.
Three-dimensional CAS-OCT clearly depicted CCI structures. The effect of corneal stromal hydration continued for 1 week after surgery.
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