factors associated with intrusion of the retinal tacks included absence of a barb at the end of the tack to anchor it to the sclera , absence of a groove in the tack , a short shaft , incomplete penetration of the retina , choroid , and sclera by the tack , self-inflicted trauma to the eye , placing a scleral buckle after inserting the tacks , and reproliferation of periretinal membranes .
C0035298
retina
C0015392
eye