Analog Input. In this example we use a variable resistor (a potentiometer or a photoresistor), we read its value using one analog input of an Arduino or Genuino board and we change the blink rate of the built-in LED accordingly. The resistor's analog value is read as a voltage because this is how the analog inputs work.
For the Haigis formula, the a0 constant moves the power prediction curve up, or down, in much the same way that the SRK/T A-constant. The a1 constant is tied to the measured anterior chamber depth and the a2 constant is tied to the measured axial length.
The court in Wickham answered this question in categorical terms: Regarding the Eichleay formula, we hold that it is the only proper method of calculating unabsorbed home office overhead. No other formula may be used.. In Wickham, the contractor, not the government, was challenging the use of Eichleay.