【摘要】 目的评价Hansatome零压力角膜板层刀切出角膜瓣厚度的预测性,探讨不同因素对其的影响。方法对行LASIK者326例652眼应用超声角膜测厚仪分别于手术前后测量角膜瓣厚度,计算实际角膜瓣厚度,并对相关影响因素进行分析。结果Z160刀头第1刀角膜瓣厚度为(113.50±15.62)μm,第2刀为(104.75±13.76)μm,第2刀切瓣厚度较第1刀薄(P<0.05)。Z180刀头第1刀角膜瓣厚度为(123.24±14.35)μm,第2刀为(116.58±16.34)μm,较标示厚度薄(P<0.05)。Z160刀头配合使用8.5mm和9.5mm负压环切瓣厚度分别为(108.32±12.64)μm和(110.20±14.39)μm,Z180刀头配合使用两种负压环切瓣厚度分别为(119.50±14.52)μm和(120.34±16.38)μm,统计学处理均无显著差异。结论Hansatome零压力板层角膜刀切出角膜瓣厚度较标示厚度薄,负压环的大小与角膜瓣厚度无关。更多还原

【Abstract】 ObjectiveTo predict the cornea flap thickness using zero-compression Hansatome microkeratome during the laser in situ keratomileusis for myopia and discuss its affecting factors.MethodsThe thickness of cornea and residual thickness under flap were measured before laser ablation in 652 myopic eyes of 326 patients using DGH550 A-scan pachymeter.Cornea flap thickness was calculated by subtracting the residual cornea thickness from the thickness of cornea.ResultsThe mean flap thickness was 113.50±15.62μm(ranged 80-147μm) in the primary eye(right eye) and 104.75±13.76μm(78-139μm) in the fellow eye(left eye),showing a thinner flap in the fellow eye comared with first eye(P<0.05) and flap thickness in the combination of Z160-plate with the suction ring at the diameter 8.5mm and 9.5mm was 108.32±12.64μm and 110.20 ±14.39μm respectively without a statistically significant difference between them(P>0.05).The mean flap thickness was 123.24±14.35μm(89-141μm) in the primary eye and 116.58±16.34μm(94-145μm) in the fellow eye,exhibiting a thinner flap in the latter than that of former(P<0.05)and that in 8.5mm-ring and 9.5mm-ring bombed with Z180-plate was 119.50±14.52μm and 120.34±16.38μm respectively without significant difference between them(P>0.05).ConclusionThe zero-compression Hanstome microkeratome can cut the thinner corneal flap.The first cut is generally associated with thickness of flap in bilateral procedure.The ring size may not affect the thickness of corneal flap.更多还原