An interesting concept
The containers, vials and insulin cartridges already come with brail, but even with this most blind people wouldn’t actually draw up there own insulin…
Vials would be very difficult for a partially sighted persons as you got to be able to see whether you’ve reached dose required and then ensure that you’ve haven’t got air in the syringe before injecting…
With cartridges you even though yes it is easier for a individual to set up there insulin pen, but you still got to have the ability to see the dose counter to ensure that correct dose is injected, as the rely on the click of the mechanism would also be a bit dodgy as it’s hard to hear, and some pens have a ratchet that doesn’t always depict a unit has passed, then you’ve got the problem at times when injecting, that you might have to change the cartridge to enable the full dose to be given, so you would have to know the amount of the dose you’ve haven injected, and the only way to find that out is to look at the dose counter to see what is left to inject!