My 14 year old cat’s eyes

The cat’s world is seen in soft focus, however; it cannot resolve detail sharply because the lens in its eye is large to gather as much light as possible.

The New Encyclopedia of the Cat by Dr. Bruce Fogle DVM

This type of eyesight must make it impossible to make out the details of a claw trimmer or even a comb.  Cat groomers need tuna-scented trimmers!