In general, for correcting nearsightedness over 3 diopters, both LASIK and PRK are better than radial keratotomy (RK).

在一般情况下，对于纠正300度以上的近视来说，LASIK和PRK手术两者均优于RK（径向角膜切开术）手术。

youdao

Conclusions:Iatrogenic keratoconus, high myopia and high astigmatism are the major cause of vision lowering after RK, PRK LASIK.

结论：RK、PRK、LASIK术后视力低下的主要原因是医源性圆锥角膜和高度近视、高度散光。

youdao

Objective:To evaluate the predictability, stability and safety of excimer laser photorefractive keratectomy (PRK) for correcting the residual myopia and astigmatism after keratotomy (RK).

目的： 评价准分子激光屈光性角膜切削术治疗放射状角膜切开术后残余近视散光的预测性、稳定性和安全性。

youdao

As the Emmy-winning founder of New York-based event production firm RK Productions, he's produced everything from the Tony Awards to the Super Bowl.

FORBES: Magazine Article

High-quality components (Alps RK 27 quad) ensure that the volume is controlled with maximum precision and a fine rotary 'feel'.

ENGADGET: Sennheiser unveils HDVA 600 analog headphone amp, asks for $1,600