Methylphenidate has not been known to cause a hemorrhage behind the eyes. Something that can cause bleeding behind the retina in both your eyes is Diabetes or a stroke of the eye.
You need to have seen an optician to find out the course of this problem. Considering some patients do suffer from pains in the eyes or headaches due to this, the doctor should prescribe some pain killers and something to suppress the bleeding such as Tranexamic acid that help the blood coagulate so that you may not loose too much blood or rather just to help subside the bleeding.
The choroid layer lies behind the retina and in front of the sclera. It carries oxygen and other necessary nourishment to the retina.
Before the retina; in the vitreous humor.
See this question: http://wiki.answers.com/Q/What_causes_bleeding_behind_the_eye
When the image focuses (falls) behind the retina
behind the retina
You mean at the back of the eye, not behind it? If so, retina
Bleeding of the retina, a key structure in vision located at the back of the eye
You will need glasses. If its focused in front of your retina then you're near-sighted (can't see close up). If its focused behind your retina then you're far-sighted (can't see far away)
farsightedness
Retinal hemorrhage is the abnormal bleeding of the blood vessels in the retina, the membrane in the back of the eye.
The retina is behind the eye The vitreous humor.