If the diabetic is careful, difficulty in measuring insulin will not occur. I have found that inaccuracy is often the result of haste or carelessness. It is reported that insulin gauges are more accurate than sight. When the plunger is pushed firmly to the gauge, the same amount of insulin will be obtained every time. Sometimes my sighted friends make errors in drawing insulin.
Syringes are mass-produced.
Although there is quality control, some errors are made in syringe markings. If a gauge is used, the measurement will be accurate no matter what the syringe shows. At first hearing, all this may sound like a lot to remember, but it is not difficult. In the last eight years we have taught about 800 visually impaired and blind people to measure and administer their own insulin independently. Vision loss does not preclude safe and effective insulin self-administration.