Views:123 Author:Site Editor Publish Time: 2020-06-26 Origin:Site
There may be different reasons for choosing a pair of optical prescription glasses. Some choose it as a fashion accessory, others to correct their eyesight. But in most cases, people choose to wear prescription glasses because they have vision problems.
After the final procedure of optometry, doctors often prescribe glasses and ask them to go to the optician's for glasses. Many people look at a lot of data and think it is too profound to be understood. In fact, the prescription of glasses is not difficult to understand.
The right eye is usually displayed in front of the prescription of glasses, which is indicated by the abbreviation ‘R’ or ‘O.D’. The left eye is abbreviated as ‘L’ or ‘O.S’.
The degree of the ball mirror, the degree of the column mirror, the axial direction of the column mirror, the pupil distance, and the added value of the downlight
Spherical lens refers to ‘the lens of myopia or hyperopia’, with the English abbreviation ‘s’ or ‘SPH’. Spherical lens is used to correct myopia or hyperopia. If the negative sign (-) is displayed before the spherical lens degree, it is myopia. If the positive sign (+) is displayed before the spherical lens degree, it is hyperopia.
The degree of the spherical lens is usually expressed as ‘D’ in English. A ‘D’ is equal to a diopter of 100 degrees. For example, the prescription ‘OD S: - 1.75D’ refers to 175 degrees of myopia in the right eye.
Cylinder lens refers to ‘astigmatic lens’. In English, it is abbreviated as ‘C’ or ‘CYL’. Cylinder lens is used to correct astigmatism. If the negative sign (-) is displayed before the degree of cylinder lens, it is myopia astigmatism. If the positive sign (+) is displayed before the degree of cylinder lens, it is hyperopia astigmatism.
The degree of Cylinder Lens is usually expressed as ‘DC’. A ‘DC’ is equal to 100 degrees of astigmatism. For example, ‘OD CYL:- 2.50DC’ refers to 250 degrees of myopic astigmatism in the right eye.
The axis of astigmatism is to indicate the direction of refractive power of astigmatic lens. The ‘axial’ direction is 90 ° perpendicular to the axis of astigmatism. ‘Axial’ is abbreviated as ‘A’ or ‘AEX’.
This refers to the degree of bifocal lens worn by presbyopic glasses for people around 45 years old. It is indicated by the English abbreviation ‘ADD’.
Pupillary distance is abbreviated as ‘pupil distance’, which is expressed in English abbreviation ‘PD’. The unit is ‘mm’. The optical center of the lens is determined by the value of ‘pupil distance’ when the glasses are made.
The purpose of optometry is to check whether the decrease of vision is caused by myopia, hyperopia, astigmatism or eye diseases. For initial optometry, it is better to conduct mydriatic optometry or fog optometry. The purpose of mydriasis or fog optometry is to eliminate pseudomyopia. Experienced optometrists will give customers a reasonable and comfortable prescription of glasses according to their specific conditions. Therefore, it is very important to choose a good fitting organization or a glasses shop to match prescription optical glasses.
The frames and lenses of prescription glasses must be selected according to the optometry prescription. Choose a frame that fits one’s face shape, and the frame distance of the spectacle frame should be close to the pupil distance. The selection of lenses can be determined according to the degree. Customers with higher degree can select lenses with high refractive index.
As for glasses processing, the state has clear rules, as well as the scale of errors in various technical indicators. Glasses within the error scale are qualified glasses. A pair of high quality prescription glasses usually needs to pass the examination of multiple procedures.
Because each person's ears, concave and convex of nose, and the width of the face is different, each wearer needs to be personalized, so that the wearer will feel comfortable. After the use of prescription optical glasses for a certain period of time, it is also necessary to regularly come to the fitting organization for necessary maintenance of prescription optical glasses.
In a word, it is necessary to carry out vision test before choosing appropriate personalized fashion prescription glasses.