The above picture is what the normal optic nerve looks like.
This is a picture of an optic nerve coloboma. It occurs when the eye doesn't develop completely. A coloboma is like a huge crater with the optic nerve on one of the slopes. This patient's vision is only mildly decreased.
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Arizona Eye Care discussed that, this is more likely caused by Patau syndrome Also called Trisomy-13. Condition caused by an extra, third copy of chromosome 13. Symptoms include severe mental retardation, a small head, microphthalmia, a cleft lip or palate, heart defects and extra fingers or toes; many patients also have an iris coloboma and retinal dysplasia (abnormal development). The majority of infants with Patau syndrome die within the first year.
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