What do the suffixes used in canthotomy and canthaplasty indicate is being done to canthus?

Here's a breakdown of the suffixes and what they indicate:

* -tomy: This suffix means "cutting" or "incision." So, canthotomy refers to an incision made into the canthus.

* -plasty: This suffix means "surgical repair" or "reconstruction." Therefore, canthaplasty refers to a surgical procedure to repair or reconstruct the canthus.