The sphere (Sph) specifies the strength of lens
required to correct your focus - a plus sphere to correct long-sightedness (hyperopic - difficulty focusing on close objects) and a minus to correct short sightedness (myopia
- difficulty focusing on distant objects.)
The CYL and AXIS compensate for an astigmatism
. So what's an astigmatism? An astigmatism is where the eye is shaped slightly like a rugby ball or referred to as ‘toric’, not a perfect sphere like a football. This just means the eye has difficulty focusing at certain angles. This box maybe empty or have a plus or a minus value in it. The measurement is the Dioptre. Most values range from +/- 0.25 to +/- 4.00 and will go up in steps of 0.25.
AXIS tells us where the astigmatism is on your eye. The measurement is in Degrees. The values range between 0 and 180 and may go up in steps of ½, 1, 5 or 10 degrees.
I hope you got it now.