A C value of -2.75 on a 3-year-old child’s vision exam indicates 275 degrees of myopic astigmatism.
When a child undergoes an optometric examination, there are usually 2 columns of results on the optometry form, one column of results is titled C, which stands for the number of degrees of columnar lenses, or astigmatism, and is actually preceded by the symbols of a negative sign for nearsighted astigmatism and a positive sign for farsighted astigmatism, respectively. The numerical value, on the other hand, represents the specific degree of astigmatism, with 2.75 indicating 275 degrees of astigmatism.
There is also a column of results titled S, which stands for Spherical Lens Degree, which is the patient’s degree of myopia or hyperopia.
An astigmatism of 275 degrees can lead to a loss of vision, which can be improved by correcting the astigmatism with appropriate glasses.
It is recommended that children with astigmatism be seen in a hospital for an evaluation of their condition and treatment as prescribed by the doctor.