I often encounter anxious parents of children who are confused by computerized optometry and subjective optometry. Therefore, today I am going to talk about optometry. So that children and their parents can be objective about the results of optometry. Computerized optometry is usually done by a computerized optometrist, and the examination is very fast. The purpose of computerized optometry is usually to “provide an approximate myopic astigmatism” and to provide an initial degree for the more accurate primary optometry (which is now usually done with a comprehensive optometrist). More succinctly, the difference between the two is that computerized optometry results are only a reference, not precise, and can sometimes differ significantly from the results of primary optometry. Primary optometry, on the other hand, is much more time consuming and accurate. In clinical practice, the prescription of glasses must be based on the results of primary optometry.