We use an advanced, computerized instrument that measures your glasses prescription in our office. This new Digital Refraction System from Marco is the biggest change in determining your eyeglass prescription in over 50 years! This automated system provides a more accurate prescription. The biggest advantage over the traditional manual instrument is it allows you to view and compare the difference between both your old and new prescriptions before you purchase your new glasses. The system also incorporates new techniques to balance the two eyes for better binocular comfort and vision.