Why does the distortion of the glasses cause discomfort?

1. Mirror angle: The angle formed by the left and right lens planes. The routine is 170-180 degrees.

2. Forward tilt angle: The angle between the plane line of the lens and the vertical line, also known as the tilt angle. Normal double glasses have the same inclination angle, generally 8-15 degrees.

3. Tilt angle of the leg: The angle between the one-sided temple and the plane perpendicular to the lens. The normal inclination angle of the legs on both sides is not more than 2.5 degrees. By adjusting the tilt angle of the body leg, the forward tilt angle of the frame can be changed.

4. External opening angle: refers to the angle between the connecting line of the two hinge shafts and the temple when the temple is fully abducted, generally 80-100 degrees.

5. Mirror distance: The distance between the apex of the spectacle lens and the anterior horn of the cornea is generally about 10-12 mm.

6. Bending length: refers to the distance from the corner of the temple to the end of the temple.

7. stipules: including the anterior horn, apex angle, and bevel angle, which can reflect the position of the nose pad, and adjust the position of the stipules to make it fit more closely with the bridge of the nose.

Understand the above parameters, what problems will the glasses frame deformer bring to the wearer?

1. Mirror angle: If the mirror angle of the fitted glasses is too flat or even outward, that is, the mirror angle is ≥180 degrees, the visual quality will be degraded due to the off-axis aberration, and even dizziness and eye fatigue.

2, the anteversion angle: the anteversion angle is too large or too small will cause the prism effect of the wearer's visual object, resulting in discomfort.

3, the position of the glasses is too high or too low: people will not be able to see through the light, the eyes are prone to eye fatigue and other symptoms.

4. The position of the glasses is tilted horizontally: it is easy to cause the eyes to pass through the uniform vertical position. It is easy to cause symptoms such as visual fatigue and compensatory head position.

5, the external opening angle is too large or too small: the external opening angle is too small, resulting in wearing too tight, the temples compress the ankle nerve and leave indentation; the external opening angle is too large, the glasses are not stable, easy to slide.

6. Mirror distance: The change of the mirror distance will change the effective mirror of the lens. Too large may cause the clarity of myopia to drop; too small, may cause oily eyes when the eyelashes hit the lens when blinking.

7. The bending point of the temple is too long or too short: the bending point of the temple should be consistent with the point on the ear. Too short results in a pressure on the back side of the auricle.

8. Asymmetry of the stipules: causes one side of the stipules to partially compress the bridge of the nose, or one side does not contact the bridge of the nose, which affects the comfort of wearing the mirror.

The deformation of the frame will cause so many problems, so how to ensure that you wear a suitable frame?

First of all, the fitting of glasses is a delicate work, even if the refractive test results and the optical distance are accurate, such as the shape of the frame does not meet the requirements when the glasses are fixed, it will largely deviate from the optometry. Quantitative parameters of the prescription. Therefore, when each qualified lens is delivered to the customer, the processor of Changsha Aier Eye Hospital will make targeted adjustments for the face and head size to achieve the most comfortable effect for the wearer.

Secondly, in the daily wearing of the mirror, both hands take the glasses, and when not wearing, put them in the glasses case to avoid damage or deformation of the frame caused by accident or external force.

Finally, after using the glasses for a period of time, it is recommended to make regular adjustments; if the glasses are deformed, do not adjust them by yourself. It is recommended to go to a professional eye hospital or optical shop for adjustment.