The medical condition of<unk>  occurs in different forms. For some, this condition might happen congenitally from birth as a result of genetic defect, for others it happens suddenly due to a form of illness or accident that results in a modality deprivation of either vision or hearing, or both. A person might be born deaf and become blind at a later stage in life, or vice versa. In any given case of<unk> , many possible onsets and causes of this condition exist; some happen gradually, others happen unexpectedly and suddenly. The diagnosis of<unk>  could be medically classified into specific types based on one’s symptoms and causes. The two overarching types of<unk>  are congenital and acquired. Congenital<unk> : the condition of<unk>  from birth * Pregnancy complexities * Effects of alcohol/drugs * Fetal alcohol syndrome * A result of prematurity * Causes from illness/infection * Rubella * AIDS * Cytomegalovirus * Congenital syphilis * Toxoplasmosis * Genetic conditions (evident from birth) * Anomalies/syndromes (numerous genetic defects may contribute to one's medical condition of<unk> , of which some of more well-known syndromes are listed) *CHARGE syndrome * Down syndrome * Marshall syndrome * Congenital rubella syndrome * Stickler syndrome * Trisomy 13 Acquired<unk> : condition of<unk>  developed later in life * Genetic conditions (evident at a later stage in life) *Usher syndrome * Alport syndrome * Age-related loss of modality (vision or auditory or both) * Illness, such as meningitis * Somatic injuries *Brain damage/trauma * Stroke * Permanent physical damage (relating to vision or hearing)
Deafblindness
Cortical deafness
Amblyopia
Buphthalmos
Cerebral polyopia
Amblyaudia
Entomopia
Childhood blindness