Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) osteoporosis-pseudoglioma syndrome ?
    ### Response:
    Osteoporosis-pseudoglioma syndrome is a rare condition characterized by severe thinning of the bones (osteoporosis) and eye abnormalities that lead to vision loss. In people with this condition, osteoporosis is usually recognized in early childhood. It is caused by a shortage of minerals, such as calcium, in bones (decreased bone mineral density), which makes the bones brittle and prone to fracture.
    