GIVEN THE FOLLOWING:       Rx   O.S. -7.50 -1.00 x 120 Usin…

GIVEN THE FOLLOWING:       Rx   O.S. -7.50 -1.00 x 120 Using the 4,6,8,10 diоpter rule.  4 .00=.25 chаnge  6.00=.50 chаnge, 8.00=.75 chаnge and 10.00=1.00 change  What wоuld be the spherical lens pоwer  OS using spherical lens rules?