Could this be mild strabismus? (photos)

Strabismus refers to lack of alignment of the visual images on the retina.  Most commonly this are from early in life and are treated to minimize the risk of developing amblyopia or lazy eye.  Acquired strabismus in adults is associated with double vision and is very annoying and obvious.  The amount of white under the eye related to the relative position of the eyelid and the relative position of the eyelids and does not imply the presence of strabismus.  If you have further concerns, I recommend you consult a fellowship trained oculoplastic surgeon.  The American Society for Ophthalmic Plastic and Reconstructive Surgery maintains a regional directory on its website that can help you find a well qualified surgeon close to home.  Their url is listed below.

Your photos indicate that you may have mild lower eyelid retraction [white showing underneath your cornea-"scleral show"].Strabismus alludes to misalignment of the eyes, or "crossed eyes", which your photos don't show.

Stabismus is a misalignment of the eyes so that they no longer move and work together to see.  The white you see under the eye is due to an eyelid malposition.  This can be surgically corrected.  You should be evaluated by an oculoplastic surgeon to see what is the cause of this recent change.  he or she will then give you options to correct it.  Good Luck.