水平的椭圆形襟翼与散光校正最常见的消融模式的形状相匹配。尽管传统的圆形皮瓣效果很好，但椭圆形襟翼代表了改进LASIK程序的机会。它们更好地符合角膜的自然解剖形状，并可以更好地对齐皮瓣。水平的椭圆形瓣匹配用于大多数近视校正的水平椭圆形消融模式。

In a study conducted the average outermost horizontal measurement was 12.0 ±0.5 mm, and the average outermost vertical measurement was 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. Round flaps can rotate when they are repositioned, causing striae. In contrast, because oval flaps can only fit into one orientation, the possibility of rotation is eliminated and ensures perfect alignment.

Round flaps invade a greater degree of peripheral vital lamellar fibers and nerves superiorly and inferiorly compared with oval flaps, which preserve peripheral fibers and nerves symmetrically. Also, fewer cuts are made vertically on the cornea with oval flaps. Because it is equidistant to the limbus from all locations, an oval flap lends itself to more symmetrical healing than a round flap. The hinge can be made along the long axis of an oval flap. This creates a wider hinge and better exposure of the stromal bed compared with round flaps, and with an oval flap, the hinge need not be ablated.

The iFS Femtosecond Laser to create a flap that is 100 μm deep with inverted 110º side cuts. My preference for making an oval flap is a 5{0730eed075b45d9e50c00d6cd42dd08773e0164f29a45151808bf89051290974} “oversized” flap set with an 8.2-mm vertical default. I find that the setting provides an 8.6-mm horizontal measurement that fits the average cornea well. I place the pocket in the superior location, as this puts both the pocket and the hinge in the visually insignificant area of cornea masked by the upper eyelid.

Based on the research the iFS Femtodecond Laser was used to treat the vast majority of LASIK patients , and they will greatly benefit from horizontally oval flaps, which correspond to horizontally oval ablation patterns for the treatment of WTR and oblique astigmatism. Oval flaps are anatomically compatible with the cornea, and they allow refractive surgeons to achieve perfect alignment of the flap.

At Laser Locators we carry the top name surgical and diagnostic ophthalmic equipment manufacturers you can trust, like Acon, Nidek, Lumenis and more for preforming all of your precise ophthalmic procedures. Contact us atwww.m.fundalarms.com或致电1-877-924-2020，并让我们的一位专家设备定位器今天为您提供帮助。