Conclusion: Research in 1417 Le Hong Phong primary school students, Dong Quoc Binh Ward, Ngo Quyen District, Hai Phong ages 6 - 10 showed that: Amblyopia pace of increase dramatically when children age 6: good is 91, 45%, eyesight decrease 1, 2, 3, 4 is 8, 69% but reducing to 10 years the eyesight of children accounted for only 47.64%, percentage of reduced eyesight student is 52.34%, The eyesight of the fastest reduction in children ages 9-10.