Horizontally oval flaps match the shape of the most common ablation pattern for astigmatic correction. And while the conventional round flap works well, oval flaps represent an opportunity to improve the LASIK procedure. They better conform to the natural anatomical shape of the cornea and allow for better alignment of the flap. The horizontally oval flap matches the horizontally oval ablation pattern that is created for the majority of myopic corrections.
在进行的一项研究中，最外面的水平测量值为12.0±0.5 mm，最外面的垂直测量值为11.1±0.4 mm。These dimensions demonstrate that the cornea is an 8{0730eed075b45d9e50c00d6cd42dd08773e0164f29a45151808bf89051290974} horizontal ellipse and that oval flaps are a better anatomical match for the cornea, because they symmetrically fit into the horizontally oval shape of the normal cornea.圆形襟翼重新定位时会旋转，从而导致纹状体。相反，由于椭圆形皮瓣只能适合一个方向，因此消除了旋转的可能性并确保完美的对齐。
与椭圆形的皮瓣相比，圆形皮瓣会侵入更大程度的周围生命层状纤维和神经，这些纤维与椭圆形皮瓣相比，它们对称地保留了周围纤维和神经。同样，用椭圆形襟翼在角膜上垂直切割的切割量更少。因为它与所有位置的边缘等距，所以椭圆形的襟翼比圆形皮瓣更具对称的愈合。可以沿椭圆形瓣的长轴制成铰链。与圆形襟翼相比，这会产生更宽的铰链和更好的基质床暴露，并且使用椭圆形襟翼，铰链不必消融。
IFS飞秒激光器会产生一个深100μm的襟翼，倒入110º的侧切割。我偏爱制作椭圆形皮瓣是5 {0730EED075B45D9E50C00D6CD42DD08777777777773E0164F29A4515151515151808BF89051290974}“超大尺寸”襟翼设置为8.2 mm垂直倾斜。我发现该设置提供了8.6毫米的水平尺寸，适合平均角膜很好。我将口袋放在上等位置，因为这同时将口袋和铰链放在上眼睑掩盖的角膜遮罩的视觉区域。
根据研究，IFS fomtodecond Laser用于治疗绝大多数LASIK患者，它们将从水平的椭圆形皮瓣中受益匪浅，水平的椭圆形皮瓣与水平的椭圆形消融模式相对应，以治疗WTR和斜阳性。椭圆形皮瓣在解剖学上与角膜兼容，它们使折射外科医生可以实现皮瓣的完美排列。
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