Abstract:

The optical zone and effective optical zone have been proven as a significant factor in determining the outcomes of corneal refractive surgery. It have been evidenced that the occurrence of night vision symptoms such as glare and haloes were directly related to the effective optical zone reduced compared with the programmed ablation zone. As a area of corneal surface with a high level of optical quality, the accurate measurements and evaluation of the effective optical zone are very important. This not just guide the design of the surgery but evidently avoid the occurrence of surgical complications.