Comparison of factors of intraocular pressure before and after excimer laser in situ keratomileusis in rabbit

Abstract

Objective To compare the application value of dynamic contour tonometer （DCT） and non-contact tonometer （NCT） before and after laser-assisted in situ keratomileusis （LASIK） on eyes of rabbit. Methods Central corneal thickness and corneal curvature of 120 healthy New Zealand rabbits were measured by Pentacam system with DCT and NCT before and one month after surgery. Meanwhile, the intraocular pressure （IOP） value was checked by means of Ehlers, Shah, Dresden, Orssengo/Pye and Kohlhaas method. Results The value of DCT was the highest before and after surgery. The differences in DCT values and Ehlers correction values before and after surgery were not statistically significant （P 〉 0.05）; The differences in IOP correction by other methods before and after surgery were statistically significant （P 〈 0.01 ）. There was a positive correlation between preoperative and postoperative IOP values at each group. Conclusion The result of the IOP value measured by DCT is not influenced by the thickness of cornea, the curvature of cornea and axial length, which can be chosen as the preferred method of IOP measurement after LASIK. The NCT correction is a powerful supplement. Key words: Check, pressure, intraocular; Tonometer, contour, dynamic; Tonometer, non-contact; Contrast ; Keratomileusis, laser, excimer