The entire globe of the eye may be abnormally small (microphthalmia). (ashgi.org)
Another method, which is much harder to complete successfully, is to surgically reposition the eyelid, or anchor the eyelid to the globe of the eye. (thesprucepets.com)
In feline glaucoma cases the globe of the eye may be enlarged (buphthalmous) or sunken (enophthalmic) causing the third eyelid to stick out a bit. (cat-health-guide.org)