Dausch D, Klein R, Landesz M, Schröder E
Department of Ophthalmology, Marien Hospital, Amberg, Germany.
J Cataract Refract Surg. 1994 Mar;20 Suppl:252-7. doi: 10.1016/s0886-3350(13)80762-6.
Excimer laser photorefractive keratectomy as a means to flatten the central cornea has generated considerable interest. With this technique radial symmetric ablations can be performed to correct myopic refractive errors and excise superficial corneal pathology. We developed a technique that uses toric ablation to correct astigmatism. A new mask was designed for the MEL 60 Aesculap-Meditec excimer laser. The mask can be rotated regularly over 360 degrees. By varying the angular distances, the surgeon can increase ablation depth in any desired meridian. As a result, both cylindrical and spherical errors can be corrected in one procedure. Seventy-three eyes with either simple, myopic, mixed, or irregular astigmatism were treated. In each category of astigmatism, the surgery reduced the spherical component as well as the overall mean preoperative cylindrical refraction. Our findings suggest that this technique is a safe and effective procedure for correcting different types of astigmatism.
准分子激光屈光性角膜切削术作为一种使中央角膜变平的方法已引起了广泛关注。通过这种技术，可以进行径向对称消融以矫正近视屈光不正并切除浅表角膜病变。我们开发了一种使用环曲面消融来矫正散光的技术。为MEL 60蛇牌美迪泰克准分子激光设计了一种新的面罩。该面罩可在360度范围内有规律地旋转。通过改变角距，外科医生可以在任何所需子午线增加消融深度。结果，在一次手术中就可以矫正柱面和球面像差。对73只患有单纯性、近视性、混合性或不规则散光的眼睛进行了治疗。在每一类散光中，手术都降低了球镜度数以及术前柱镜的总体平均度数。我们的研究结果表明，该技术是一种矫正不同类型散光的安全有效的方法。
