In order to ensure that the child's eyesight is healthy, most parents will have a systematic vision checkup when the child is just born. But when faced with the simple letters and numbers on a child's vision checklist, parents can't make sense of it. In fact, it is not difficult at all to understand the child's vision checklist, let's see what the experts of Hefei Xiangchuang Intelligent Vision Screening System say: In the vision checklist, find the two letters R and L, (sometimes written: OD and OS), which mean respectively: the right eye and the left eye.
L/OS (Left)-Left Eye
R/OD (Right)-Right Eye
After these two letters, there is a line of letters and numbers. They stand for:
S (Spherical): Spherical lenses, representing degrees of myopia or hyperopia, "+" for hyperopia and "-" for myopia;
C (Cylindrical) : cylindrical lens, representing the degree of astigmatism, "+" for hyperopic astigmatism, "-" for myopic astigmatism;
A(Axis): axial, representing the direction of astigmatism;
And the number is to represent the corresponding degree, such as: 2.50D represents 250 degrees.