R (right) or OD- right eye-If the diopters of the left and right eyes are different, please pay attention to the distinction.
L (left) or OS- left eye
S (spherical surface)-spherical lens-the degree of myopia or hyperopia.
C (cylindrical)-cylindrical lens-astigmatism.
A (axis)-axis position-astigmatism direction.
VA (vision)-vision-clarity when looking at things.
PD(R), PD(L)- the pupil distance of one eye-the distance from the pupil center of the left and right eyes to the center of the bridge of the nose.
PD(r+l)- the pupil distance of both eyes-the distance between two points in the pupil center of the left and right eyes.
There will be one of the two symbols "+"or "-"before the number on the optometry sheet.
"+"means hyperopia lens (convex lens); "-"means a nearsighted lens (concave lens). The Arabic numerals after "+"or "-"in the prescription are the diopter of the lens, but it should be noted that the diopter in the prescription of glasses is different from what people usually say. For example, S- 1.00D is equivalent to myopia100d, and -3.00D is equivalent to myopia of 300 degrees.
Myopia and hyperopia are also usually expressed by DS. Astigmatism is also common in DC.
Practical exercises:
When reading the computer optometry list, the most important thing to know is the average value of three optometries, myopia or hyperopia, and the degree of astigmatism.
By clearly understanding the meaning of each symbol from the computer optometry sheet, we can know the optometry data such as the degree of our eyes, astigmatism, the orientation of the astigmatism axis, and the distance between the pupils.
However, it should be noted that although the operation is simple and fast, the degree of computer optometry is not equal to the degree of glasses.
Computer optometry is an objective optometry method, which uses machines to detect the visual condition of eyes. There is often some deviation between the computer reading and the actual situation. The errors caused by computer optometry results are mainly high myopia, low hyperopia and astigmatism axis difference. Therefore, the results of computer optometry can only be used as a clinical reference, not as a prescription for glasses directly.
At present, the relatively safe and standardized methods for opticians should be darkroom examination and fitting correction after computer optometry, and the prescriptions of opticians vary from person to person, which is highly personalized. The prescription of the optician is related to the patient's age, occupation, living habits, optician's habits and binocular visual function parameters. Therefore, it is necessary for doctors to give the most "appropriate" prescription for opticians.