Table 1.

Disease key words

Search Number	Disease Key Words
1	"glaucoma" (1)
2	"age-related macular degeneration" or "AMD" or "age related macular disease" or "age related maculopathy" or "ARMD" or "macular degeneration" or "macular disease"
3	"type 2 diabetes" or "type II diabetes" or "type two diabetes" or "diabetes mellitus"
4	"hearing impairment" or "hearing loss" or "loss of hearing" or "deafness"
5	"rheumatoid arthritis" or "rheumatic gout" or "rheumatoid disease"
6	"parkinson's disease" or "parkinson disease"
7	"Multiple Sclerosis" or "MS" or "Acute Fulminating Sclerosis" or "Disseminated Sclerosis"

(1) Since synonyms for the disease all tend to contain the word 'glaucoma' (i.e. primary open angle glaucoma, normal-tension glaucoma, secondary glaucoma), it was assumed that the term "glaucoma" alone would be sufficient to encapsulate all forms of the disease