When matching glasses, it is important to choose the appropriate refractive index, frame material, and lens brand.
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When matching glasses, it is important to choose the appropriate refractive index, frame material, and lens brand.
When matching glasses, it is important to choose the appropriate refractive index, frame material, and lens brand. High refractive index can make the lens thinner, but it may affect clarity. The frame material should be pure titanium with IP electroplating to avoid overweight or displacement of the lenses. In terms of brand, it is advisable to avoid choosing low-quality brands. The process of optometry is also crucial, requiring careful inspection and ensuring accuracy of the degree.
About lenses
Choose the corresponding refractive index based on your own degree to prevent being deceived.
Choose 1.56 refractive index from 0-300 degrees
Choose 1.60 refractive index at 300-500 degrees
500-800 degrees with a refractive index of 1.67
Choose a refractive index of 1.74 for temperatures above 800 degrees
The higher the refractive index, the thinner the lens, but the Abbe coefficient may be lower, which is a parameter that affects the clarity of the lens. The selection of refractive index and Abbe coefficient should be comprehensively considered.
The smaller the pupil distance and the larger the frame, the thicker the matched lenses can be upgraded to a higher refractive index, or the frame can be selected to be smaller.
About Mirror Frames
Try to choose pure titanium with IP electroplating as the material. IP electroplating process, also known as vacuum plating, is currently a relatively advanced electroplating process on the market.
The legs of the mirror are usually marked with the symbols Titanium ip or Ti IP, which can be recognized by oneself.
Be sure to choose a small frame for the height, otherwise the lenses will be too thick and the glasses will be too heavy. Prolonged pressure under the bridge of the nose can cause deviation of the pupil distance, which poses a risk of increasing the degree!
About optometry
If you are given 3 minutes to complete the optometry, then tell him to see you again! Only using an optometry machine to perform optometry and then printing an optometry form cannot be used for direct glasses.
The correct steps for optometry: consultation – objective examination – old mirror parameters and visual acuity examination – dominant eye examination – measuring pupil distance – objective degree placement – determining astigmatism with a far fog astigmatism disc – balancing red and green in one eye – determining astigmatism with a cross column mirror – secondary red and green balance – binocular balance – four point examination – trial wearing – issuing a prescription – advice.