They look like dark red lines under the retina - almost like blood vessels. I'd recommend using google to search for a selection of images to look at.
They are associated with SLAPPERS:
- Sickle cell disease
- Lead poisoning
- Acromegaly
- Pagets disease
- Pseudoxanthoma elasticum
- Ehlers-Danlos
- Raised calicum/phosphate
- Short people
Onwards to SIADH...
