| SSN | severely subnormal; subacute sensory neuropathy; suprasternal notch |
|---|---|
| TON | traumatic optic neuropathy |
| XBSN | X-linked bulbospinal neuropathy |
| PPN | painful peripheral neuropathy |
| SMON | Subacute Myelo-Optico-Neuropathy |
|---|---|
| HMSN | hereditary motor sensory neuropathy |
| NAION | non-arteritic ischaemic optic neuropathy |