Glasses are a special kind of merchandise. It is aimed at improving eyesight, and requires clarity and comfort after wearing. But in the dispensing process, often there will be some new customers reflect, after wearing glasses uncomfortable, always feel uncomfortable, uncomfortable, with the original glasses don’t feel the same. The technical indicators detect new best fake Ray Bans, such as refractive deviation, light level deviation and vertical deviations, axial deviation and so on, are in line with the requirements of. If customers are allowed to go back for a few days or even weeks, some may accept them, while others may not be able to accept them even after a period of adjustment. Why is that?
Under normal circumstances, the optical center deviation distance and interpupillary distance as small as possible, if patients with previous glasses photocentre horizontal deviation, degree is higher, the new mirror set according to the standard PD optic center position, after wearing it may feel discomfort, such as dizziness, visual bending, left eye to block this situation the diopter is bigger, more obvious reaction. Therefore, before buying cheap Ray Bans, should first measure the distance and deviation of the size of the old pupil glasses photocentre level. But from the protection of visual acuity and eye health point of view, the new glasses should refer to the original mirror optical center distance and pupil to compromise. For older people do not apply, it is best to maintain the original state, so as not to cause discomfort, there are other problems.
The tilt of a frame leg refers to the angle between the plane normal of the mirror and the leg of the mirror. Because of the deformation of the eyeglasses frame in many nonstandard glasses frames and glasses, the influence of the inclination size on the visual habit is formed. Because of the position of the glasses legs are mostly connected in the upper part of the mirror ring frames, and because of the gravity of the glasses, so when wearing cheap fake Ray Bans photocentre position offset. In this case, the inclination of the leg can be adjusted so that it is close to the original mirror.
According to the diopter of old glasses can mirror the status of patients. This is especially important for some elderly patients because it is not easy to change a long-term habit of wearing a mirror. This so-called substandard glasses, but in line with the patient’s eye status, patients wear it will be comfortable and natural. For younger patients with lower degrees and short glasses, they should be allowed to wear standard glasses.
General requirements of myopia correction vision can reach 5, excessive correction will pay attention to near the object when the amount of eye muscle regulation, resulting in visual fatigue and refractive degree of further deepening. Therefore, when the primary mirror is over corrected and the corrected vision is 5.2 or higher, the new mirror should be adjusted to 5. In this way, some patients feel uncomfortable when they wear new Ray Ban sale fake because of the decrease of their refractive power, such as depending on the object and so on. At this time, according to the actual situation, 5 of the normal state should be allocated.
For glasses with astigmatism, the discrepancy between the new mirror and the astigmatism axis of the old mirror can not be ignored. Although the new mirror axis may be the most visible position of vision, it is not necessarily a comfortable position for the patient. Therefore, the patient can not adapt to the new axis and has little influence on the correction of vision, it can be directly positioned as the axis.
Because of the difference of refractive index, transmittance and Abbe coefficient of light white film, super thin film and resin film, the wearing effect of cheap fake Oakleys is different for the same diopter.
Nose position can directly affect the relative position and the optical center of the lens and the cornea pupil after the vertex to the distance, will affect the actual visual effect of Ray Ban outlet online.
For corrective lenses, the effective diopter of the ophthalmic lenses increases with the distance from the vertex to the cornea, and decreases with the distance from the posterior vertex to the cornea. For the correction of myopia by negative lenses, the effective diopter of the cheap Oakleys glasses decreased with the distance from the vertex to the distance of the cornea, and then decreased with the distance from the vertex to the cornea.