Differential Diagnosis Clinically<unk>  must be distinguished from: # VIth Cranial nerve or abducens palsy # Nystagmus Blockage Syndrome #<unk>  arising secondary to central nervous system abnormalities (in cerebral palsy for example) # Primary Constant<unk>  # Duane's Syndrome
Infantile esotropia
Dissociated vertical deviation
Ectopia cordis
Cerebral achromatopsia
Ametropic amblyopia
Nonsyndromic deafness
Lipoatrophia semicircularis
Cystic eyeball