defect esotropia, exotropia, hypertropia, hypotropia

anatomy care condition crossed defect defects deform deformation deviation diagnosis diagram disease disorder doctor downward education esotropia exotropia extraocular extrinsic eye eyeball focus health horizontal human hypertropia hypotropia illustration inward iris look medical medicine movement muscle normal ophthalmologist ophthalmology optic optical optometry organ orthoptist outward patient pupil science sensory squint strabismus types upward vision visual