ERG Components in Schizophrenia and Bipolar Disorder Type I

Inclusion Criteria: * Able to give written informed consent; * 18 to 50 years old; * Patient with a likely diagnosis of SZ or BPI for at least 12 months, that resulted in a diagnosis of SZ or BPI with a Structured Clinical Interview for DSM-5 (SCID-5-CT); * Control subjects who do not have a lifetime diagnosis of SZ, BP, other psychotic disorder, recurrent mood disorder or have not met criteria for a major depression episode in the last 12 months according to DSM-V criteria. Exclusion Criteria: * Control subjects taking antipsychotic drugs (other prescription medicines are allowed); * Control subjects with a first-degree relative with SZ, BP, other psychotic disorder or recurrent major depressive disorder; * Patient currently in an acute inpatient unit and not stable (i.e. experiencing an acute exacerbation of psychosis or mania); * Diagnosed dementia, Parkinson's disease, autism or other pervasive developmental disorders or seizure disorders (such as epilepsy); * Substance use disorder within the last 6 months; * Any known diagnosis of ophthalmological abnormalities, such as diabetic retinopathy, glaucoma, change in intraocular pressure, macular degeneration, other retinal pathologies, congenital color vision deficiencies, strabismus or cataract; * Any person contra-indicated for an ERG test, including active corneal or conjunctival disease (e.g. pink eye or conjunctivitis), infection or a ruptured globe; * Subjects in recovery phase following cataract surgery or post LASIK refractive surgery or trabeculectomy or any surgical/laser intervention, suspected penetrating ocular injury, ocular prosthesis or severe photophobia; * Any person unable to or unwilling to participate in a psychiatric evaluation or ERG testing, including, in the clinical judgment of the Principal investigator, subjects with cognitive impairment that compromises their ability to participate meaningfully in a SCID-5-CT interview. * Any subject during the course of the study that is pregnant or intends on becoming pregnant and/or receives or intends to receive fertility treatments. Subjects becoming pregnant during study will be excluded.