Perancangan dan pembuatan alat ukur dioptri kacamata dengan menggunakan metode dua lensa berbasis mikrokontroller AT89S51

To determine the strenght of eyeglass lens that suitable for heterophy is usually used a trial method. This method is uneffective because need many lens and sometimes is used Retinoskop Canon RK-F1 that the price so expensive.

The purpose of this thesis was to get dioptry measurement equipment of eyeglass (the strenght of lens) that suitable for the heterophy especially ametropia. The method used to determine lens strenght of eyeglass is two lens method which is combination of two dome shaped with the some focus value. The focus value used in this research is 25 cm.

The sample of this research obtained from student Islamic State University (UIN) of Malang who used the eyeglass. The data collecting start on February- March 2008. Then the data was analysed and compared with the results of check- up in the optic that to determined the plessision of the strenght of convex lens of eyeglass using two lens method.

The result of examination to dioptry dome shape of glasses, in controlling system in order microcontroller AT89S51, motor stepper, even liquid cristal display (LCD) it can be coneluded that using the design can determinate the strenght of lens that identical with the optic mesuarement. Using the method shows the relative miscalculate about 8.09%.