In the photos you've posted, the eye appears within normal limits. I can make out the iris, pupil, sclera, and conjunctiva at least partially in some or all of the pictures. The only way to assess the eye functionally is in person with the presence of ophthalmic tools. However, I see no reason to recommend any further diagnostics unless you suspect Memo is having problems with eyesight or is having other ophthalmic issues. Hope this makes sense.