1. Generate the following new variables: EIEIEIEI EIEI age [use the formula: (examdate-birt'r1date)f365] average acuity of two eyes, BM] (body mass index=weight (Kg) divided by squared height (m2)), years of education [You have to define a variable and replace it with 16 if the value in the variable headeduc is 1; replace it with 14 if the value in the variable headeduc is 2; replace it with 12 if the value in the variable headeduc is 3 or 4 or 5; replace it with 9 if the value in the variable headeduc is E; replace it with 6 if the value in the variable headeduc is 7; replace it with 0 if the value in the variable headeduc is 8.] four dummies for head occupation being farmer, worker, teacher, or village leader, [Occupation codes are defined in the variable headocc as follows: headocc=1 represents farmer; headocc=2 represents worker; headocc=3 represents teacher; headocc=6 represents village leader, headocc=4 and 5 and 7 and 8 represent others] a dummy variable for this variable that is one if the person had glasses before project, average of the three test scores then the zscore of the total test (score minus average divided by standard deviation}