Can Labetalol or an Alpha+Beta-blocker therapy reduce blurry vision&poor cognitive function due to longstanding vasoconstriction from a stim-overdose?

Are you asking about. neuropsychological effects of chronic misuse/ overprescription of amphetamine or methylphenidate or chronic use of methamphetamine or cocaine ? Was did brain MRI show? Have you seen an ophthalmologist? Chronic misuse of amphetamine causes low levels of dopamine in the prefrontal cortex , associated with cognitive deficits diagnosed by neuropsychological tests. Beta blockers won't reverse this.