A. The short answer here is âUsually- yes.â A check valve is a one-way valve. It gets installed in the discharge pipe of your sump pump. When the pump runs, the water is forced out through the valve. When the pump shuts off, gravity wants the water in the discharge pipe to fall back into the sump pit.
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So the prescription for reading glasses for the right eye would be -0.25 â 0.50 x 180. For the left eye, the calculation is +1.75 +1.00 = +2.75 D.S. Note that most people have prescriptions unlike the example shown above and usually have numbers similar in power for both eyes.