Optometrist & ophthalmologist 👀 on Instagram‎: "Strabismus — also known as hypertropia and crossed eyes — is misalignment of the eyes, causing one eye to deviate inward (esotropia) toward the nose, or outward (exotropia), while the other eye remains focused. What causes strabismus? Uncorrected refractive errors. Poor vision in one eye. Cerebral palsy. Down syndrome (20% to 60% of people with Down syndrome also have strabismus). Hydrocephalus (a disease that you’re born with that results