Past year left outside corner of eye get white crust 7-8 times a day, also see black spots and some blurriness. Causes?

Crusting. Likely due to demodex or bacteria: use warm compresses and diluted tea tree oil (see [email protected] for details) to clean closed eyelid/lashes every day for 7-14d. May need Rx erythromycin ointment if no improvement in 3 days. Black spots likely due to vitreous changes: see eyeMD for dilated exam.
See eye doctor. Glaucoma is a leading cause of adult blindness. You need to be tested to rule this out and check for uveitis or chronic allergic conjunctivits. See your eye doctor now. I hope you feel better soon.