Final answer:
Excessive edge lift with Ortho-K lenses can cause corneal staining and discomfort due to mechanical irritation and inadequate tear exchange, possibly resulting in micro-abrasions and epithelial breakdown.
Step-by-step explanation:
Excessive edge lift with Ortho-K can cause corneal staining and discomfort. Ortho-K, or Orthokeratology, is a process involving specially designed contact lenses that temporarily reshape the cornea to improve vision. When the lenses do not fit properly, as in the case of excessive edge lift, they can cause mechanical irritation and may impede proper tear exchange beneath the lens. This poor fit leads to friction against the cornea, which can cause micro-abrasions or epithelial breakdown, resulting in corneal staining. This damage to the corneal epithelium can be detected by special dyes during an eye examination. Furthermore, the discomfort caused by the lenses can discourage compliance with the Ortho-K treatment protocol. It is crucial for those undergoing Ortho-K to have regular follow-ups with their eye care professional to ensure proper lens fit and to prevent complications such as corneal staining and discomfort.