"25- 50% are birth-related 2"
"CT is not a sensitive test and should not be considered a reliable diagnostic tool. MRI is more sensitive than CT, especially sequences such as T2* and SWI sequences. The sensitivity varies between 50-75% depending on the studies and on the presence of an orbit-specific SWI sequence 8. Moreover, MRI is highly specific and has a very high positive predictive value 9,10."
"In adults, retinal haemorrhages are most commonly seen after 40 years of age, usually as a consequence of a systemic disorder and its prevalence will depend on the underlying cause i.e. ~35% in patients with diabetes mellitus 6, and ~10% in patients with hypertension 7. Other less common causes in adulthood are some ocular diseases (e.g. age-related macular degeneration, polypoidal choroidal vasculopathy, retinal vein occlusion), anaemia, leukaemia, connective tissue disorders, preeclampsia, bacterial endocarditis, and trauma."