1. Performing the laser ablation in the deeper corneal stroma provides for more rapid visual recovery and less pain than the earlier technique, photorefractive keratectomy (PRK).

2. The intensity of corneal Backscatters measured by corneal densitometry has been applied for evaluating various diseased conditions such as postoperative corneal haze after photorefractive keratectomy [18, 23], corneal opacity in bacterial keratitis, and corneal clouding in patients with mucopolysaccharidosis [24].