How to match qualified glasses?

Abstract: usually after some necessary inquiries, objective optometry is carried out first. Through objective optometry, we can quickly know the subject’s initial refractive error, so as to lay a good foundation for subsequent subjective optometry.

when you wear the new glasses, you feel dizzy, eye swelling and other discomfort. After the adaptation stage, you still feel uncomfortable. It is likely that your glasses are unqualified. A pair of unqualified glasses not only can’t correct and protect your eyesight, but will cause new ametropia (degree deepening). So, how can you choose a pair of qualified glasses?

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are compiled in the previous section “do you think you’ll be done with a computer optometry???” A pair of qualified glasses should have three standards: comfort, durability and clarity.

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should be matched according to the optometry prescription issued by the regular hospital. The eye power is determined not only by the computer optometry results, but also according to the ophthalmologist’s ophthalmic examination, and then according to the age of the optician, the eye adjustment ability, the coordination ability of both eyes, as well as the impact of disease on refraction. After wearing glasses, the eye power should be rechecked regularly and adjusted in time

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optometry methods are divided into two categories: Objective optometry and subjective optometry.

objective optometry

objective optometry is usually carried out first after some necessary inquiries. Through objective optometry, we can quickly know the subject’s initial refractive error, so as to lay a good foundation for subsequent subjective optometry. Common objective optometry include computer optometry and retinoscopy optometry. The preliminary optometry results of the subject are obtained through computer optometry or optometry, and subjective optometry is carried out on this basis.

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cannot exclude the influence of regulatory factors due to objective optometry, especially children and adolescents or hyperopia patients, Because the eye muscle regulation function is too strong, it is necessary to use a paralyzing agent (mydriatic Optometry). The true refractive state and diopter can be understood only after the pupil is dilated. However, for ametropia over 40 years old, especially those with glaucoma tendency, it is recommended not to use mydriatic optometry to avoid inducing glaucoma.

The refractive examination based on the patient’s subjective perception is subjective optometry.

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and there are many categories in subjective optometry. We give you an encyclopedia on a 5-point system.

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are divided into: subjective inserting method;

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2 points: computer optometry + subjective inserting method;

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3 points: computer optometry + other vision examination + subjective insertion method;

4 points: 3 points + binocular balance adjustment;

5 points: 4 points + eye position examination + binocular monocular function + adjustment status + diopter status + collection function, etc. make comprehensive judgment and give optometry prescription.

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in which 1-3 points of optometry can be called routine optometry or primary optometry; 4 ~ 5 points can be called medical optometry. Medical optometry must use a comprehensive optometer. So why use a comprehensive refractometer? As we all know, when a patient with myopia wears -3.00d corrective lenses, the corrected visual acuity can reach 1.0. When -3.25d, -3.50d, -3.75d and -4.00d, these five corrective lenses can make the corrected visual acuity reach 1.0. If conventional optometry is used, only one of the five corrective lenses can be selected as optometry prescription, which has a certain randomness. It is not the case in medical optometry. According to the examination results of the subject’s eye position, adjustment, binocular monocular vision and collective function, it can only select one fixed lens, or even -2.75d as the final optometry prescription. Therefore, medical optometry and conventional optometry have different meanings and contents. From a medical point of view, the purpose of wearing corrective glasses is not only to make patients see objects clearly, but also to make them comfortable to wear glasses, and can treat some possible eye diseases, such as visual fatigue, implicit inclination or implicit inclination, and medical optometry is the basis.

in developed countries, optometry and glasses matching must be carried out by talents who have received medical training and qualified by relevant national departments. However, the quality of some optometrists in China is low. In order to make up for the technical defects, some optical shops are equipped with computer optometry machines. This optometry can quickly give refractive data, but there is a certain gap between the refractive data provided by the computer and the refractive power of the tested eyes, which is particularly prominent in teenagers. Because the computer can not rule out people’s eye adjustment function at present, according to the data obtained, myopia may be over corrected and hyperopia may be under corrected. Therefore, teenagers should first go to a regular hospital for medical optometry.

measure pupil distance. The optical center of the matched lens must be in the center of the pupil of the wearer. Whether there is deviation in the optical center of the lens, including horizontal deviation and vertical deviation, is also a main index reflecting the quality of glasses. When the optical center distance of the lens is less than the actual pupil distance, the eye should use the collection function too much, which will promote the development of myopia. If the optical center distance of the lens is greater than the actual pupil distance or the optical center deviates up and down, eye swelling, headache and other visual fatigue symptoms will appear when viewing the object, so that the new glasses can not be used. This is also the reason why you can’t blindly choose large frames. Because the human eye has no adjustment ability in both up and down, even if the optical center of the lens is accurate and the vertical optical center of the left and right lenses is misaligned, the patient will feel uncomfortable wearing glasses. The average deviation of the vertical optical center of the left and right glasses that can be tolerated by human eyes is 0.125cm, which shall not exceed 0.25cm. The diopter of the lenses equipped with

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shall be consistent with the diopter on the optometry sheet. If the deviation exceeds the national standard, it will accelerate the development of myopia or hyperopia. If the optician has astigmatism, the axial position of the cylindrical lens of the matched lens shall also be consistent with that on the optometry sheet, If it exceeds the national standard (the error should be within 5 degrees), it will cause new astigmatism. The

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lenses have better light transmittance. If there is a defect in the center of the lens, it will affect the light transmittance of the lens and bring shadow. In addition, the thicker and heavier the color changing lens, the more it will affect the light transmittance of the lens. Therefore, it is recommended that those with moderate or more ametropia should not be equipped with color changing lenses.