very interesting link! thanks!
Just a thought, but there is a form of migraine headache with aura called (seriously) Alice in Wonderland syndrome. It can cause things to look temporarily distorted; much smaller or much larger than they normally are, for example. See the link below.
http://www.clevelandclinic.org/health/health-info/docs/3200/3266.asp?index=11253
a unique complaint.
most depth perception problems are either refractive (need for glasses/contacts) or oculomotor (the way your eyes move together or "team".
list of possibilities off the top of my head with that complaint:
hyperopia (farsightedness), incorrect spectacle/contact lens Rx if you have glasses or contacts, uncorrected astigmatism, convergence insufficiency, convergence excess, spasm of accommodation...there are more.
none of those would be serious. most of those could diagnosed in an eye exam & could be helped by use of glasses/contacts.