What are the elements required to fit a suitable pair of glasses?
Optometry data
We must first have an accurate optometry data. Among them, spherical lens, cylinder lens, axial position, visual acuity, interpupillary distance and other parameters are indispensable. It is best to go to a regular hospital or a large optical center or optical shop to inform the doctor about the purpose and daily eye habits, and get the best Correction data.
Abbreviation Full name Description
R (or OD) Right eye If the left and right eyes have different refractive powers, please pay attention to the distinction
L (or OS) left eye
S (Sphere) The degree of myopia or hyperopia, + means hyperopia,-means myopia
C (Cylinder) Cylindrical lens The degree of astigmatism
A (Axis) Axis position The axis of astigmatism
PD Interpupillary distance The distance between the centers of the left and right pupils
E.g:
1. Right eye: myopia 150 degrees, myopic astigmatism 50 degrees, the astigmatic axis is 90, the corrected visual acuity with glasses is 1.0, the left eye: myopia 225 degrees, the myopic astigmatism is 50 degrees, the astigmatism axis is 80, the corrected visual acuity is 1.0
Spherical lens S Cylinder lens C Axial position A to correct vision
R -1.50 -0.50 90 1.0
L -2.25 -0.50 80 1.0
2.Right eye myopia 300 degrees, astigmatism 50 degrees axis 1; left eye myopia 275 degrees, astigmatism 75 degrees axis 168; interpupillary distance 69mm
Frame material
There are many materials for the frame, generally metal, plastic, and resin. Among them, the titanium metal frame is relatively light and comfortable, and has anti-allergic and corrosion resistance, which is a more ideal frame material.
Nowadays, large-frame glasses are more popular. What needs to be reminded is that friends with deep power should not blindly follow the trend and choose large frames when choosing a frame, because first of all, the deep-powered lens will be relatively thicker, and the larger the frame will make the glasses more suitable. It is heavier, and it is easy to slide down when wearing glasses, which can easily cause the deviation of the optical center of the glasses. Secondly, the interpupillary distance of most adults is about 64mm, and the large frame will inevitably shift during processing, which will easily produce prisms, which will affect the visual quality. It is recommended to choose N1.67 or N1.74 refractive index for high number lenses. Friends of low power try not to choose half-rim and rimless glasses, because the lenses are too thin, and the lenses are easily damaged during use.
In addition, we should also pay attention to the size of the frame when choosing the frame. You can use the size data on the temples of the old frame as a reference to select a new frame.
Lens selection
The lenses are made of glass, resin, PC and other materials. At present, the mainstream is the resin sheet, which is lighter and not fragile, while the PC lens is the lightest, has strong impact resistance and is not easily broken, but has poor abrasion resistance and low Abbe number, which is suitable for wearing during exercise.
The refractive index mentioned above, the higher the refractive index, the thinner the lens, and of course the price will be more expensive. Under normal circumstances, 1.56/1.60 is sufficient if the temperature is below 300 degrees.
In addition to the refractive index, another important coefficient of the lens is the Abbe number, which is the dispersion coefficient. The larger the Abbe number, the clearer the vision. For now, the refractive index of 1.71 (new material) Abbe number 37 is the combination of the best refractive index and Abbe number, and it is a good choice for friends with high numbers. In addition, we also need to verify the authenticity of lenses purchased online. Generally, large manufacturers such as Mingyue and Zeiss can verify the authenticity of lenses online.
Face shape and frame shape
Round face: It belongs to people with plump forehead and lower jaw. This type of face is suitable for choosing thick, square or angular frames. Straight or angular frames can greatly weaken your silhouette. Please choose lenses with deep and subtle colors, so that you can look thin. When picking, make sure that the width is not wider than the widest part of the face. Too exaggerated will make the face look too big or too short and ridiculous. Avoid square or round glasses. If it is a big nose type, it is recommended that you wear a large frame for balance. The small nose type naturally needs a relatively small, light-colored, high-beam frame to make the nose feel longer.
Oval face: It is an egg-shaped face. The widest part of this face shape is located in the frontal area and moves smoothly and symmetrically to the forehead and chin. The outline is beautiful and beautiful. People with this type of face can try a variety of things, square, ellipse, inverted triangle, etc. are all suitable, you are born to wear sunglasses, no matter what style is very suitable for you, just pay attention to the size ratio. You can choose a horizontal frame that is slightly larger than the line of your face. The transparent titanium frame will make your face look more elegant and attractive.
Square face: the so-called Chinese character face. This type of face generally gives the impression of sharp edges and corners and a rigid character. Therefore, you should choose a pair of glasses that can not only relax the facial lines, but also reflect the facial features appropriately. Eye frames with thin, oblate or square frames with rounded edges should be the ideal choice. This kind of spectacle frame can soften the protruding angle of the face, and make the square face appear round and long in the angle of view.
Triangular face: For this kind of angular face shape, it is very suitable for round and oval frames to ease the more rigid lines of your face. A pair of streamlined glasses can better make up for the shortcomings of sharper and shorter lower collars.
Heart-shaped face: In fact, it is a melon-seeded face, that is, with a pointed chin. People with this type of face should try to avoid using large and square frames, because this will make the face wider and narrower. You can choose a round shape. Or an oval frame to match your face shape.
Is it reliable to buy glasses online?
Online glasses seem to save money, but in fact there is a potential risk of eye damage! Online glasses are not as considerate as a physical store in all aspects of optometry service, selection, and after-sales service.
Optometry service
Optometry is a highly technical medical practice. We dispense lenses in physical stores, and optometrists usually provide eye services very carefully to get the optics that best suits our daily eye habits.
If you want to match glasses online, first of all, the accuracy of the optometry data cannot be guaranteed. Some friends choose to buy lenses online after measuring the number in the hospital. Here we need to remind everyone that the optometry of many eye hospitals does not take our eye habits into consideration. , Working environment, etc., after the obtained data is equipped with glasses, there may be various problems such as over-correction, and long-term wearing can also cause eye damage.
Frame selection
I believe everyone has such an experience. It may take longer to buy frames than clothes. This is because we not only have to choose frames that look good, but also wear them comfortably, lightly, without clamping the face, and hypoallergenic. This requires us to choose one by one in the physical store, until we choose the frame that we think we wear is good-looking, comfortable, and of good quality. During this period, the clerk will also enthusiastically provide us with suggestions to help select.
If you choose to buy the frame online, the customer service will just throw out a bunch of pictures and let you feel it yourself. At present, there is also a human face try-on system, uploading photos can get a virtual wearing effect, but regardless of whether it will be “photo cheating”, its comfort is difficult to guarantee. If the return and exchange time, energy, freight, etc. are also a big loss.
After-sales service
Glasses are not a one-off sale, and their after-sales service is also crucial. At present, basically all physical stores will provide free nose pad replacement, frame adjustment, glasses cleaning and other services, which are not available in Taobao stores. Taobao stores generally give lens cleaners or promise to adjust the frames for free, but they need to The buyer bears the freight and so on.
Even if Taobao stores can unconditionally help customers adjust the frames, it is difficult to achieve adjustments that meet customer needs.
Post time: Jan-26-2022