Cameralenssize chart

I'm afraid that the sales process does not pay attention to these details, or the sales staff are not professional, and the actual interpupillary distance cannot be processed, which is more troublesome. Even some irresponsible stores directly increase the pupillary distance for customers to wear, which is very unprofessional. The wrong pupil distance will produce prism effect. The higher the degree, the greater the deviation and the greater the prism effect. Uncomfortable wearing, causing visual fatigue.

But the lens does not exist independently, it needs to be matched with the frame to match the appropriate glasses to the customer. Here is the question of whether the diameter can achieve the actual interpupillary distance of the customer.

The geometric center of the frame-the customer's interpupillary distance + the maximum oblique line of the lens on the frame + 2 = the minimum diameter. (2 is the error reserve)

This method often needs to be considered in the fitting of hyperopia/presbyopia, and human eyes need to see the near eyes internally, and the near pupil distance is smaller than the far pupil distance. Especially for high-presbyopia/presbyopia glasses, the smaller the diameter, the thinner. Experienced optometrists will recommend customers to choose a more suitable frame, you can choose a smaller diameter, then the lens will be lighter and thinner. Even if you choose a low refractive index lens, as long as the diameter is small enough, it is relatively thin. This highlights the importance of professionalism.

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How to choose a larger frame in this case, then the minimum diameter is greater than 65, and the lens with 65 cannot achieve the customer's interpupillary distance.

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The diameter of myopia spot lens is 65-80, the most common is 70 or 75 diameter, 80 diameter is relatively rare. The center thickness of myopia lens is the same, the refractive index is the same, the curvature of the lens is the same, and the thickness is the same.

Cameralens diameter

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For example, the geometrical interpupillary distance of the frame is 70, the customer's interpupillary distance is 62, and the maximum oblique line of the lens is 54, then the minimum diameter is:

Lens diameterglasses

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Now that the lens has been selected, the only solution is to customize the lens, make a larger lens diameter or do a center shift. Failure to do a good job in the early stage will only increase the cost in the later stage, and customers will wait longer.

The diameter of myopia spot lens is 65-80, the most common is 70 or 75 diameter, 80 diameter is relatively rare. The center thickness of myopia lens is the same, the refractive index is the same, the curvature of the lens is the same, and the thickness is the same.

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