Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Stargardt macular degeneration absent or hypoplastic corpus callosum mental retardation and dysmorphic features ?
    ### Response:
    What are the signs and symptoms of Stargardt macular degeneration absent or hypoplastic corpus callosum mental retardation and dysmorphic features? The Human Phenotype Ontology provides the following list of signs and symptoms for Stargardt macular degeneration absent or hypoplastic corpus callosum mental retardation and dysmorphic features.
    