How to measure the interpupillary distance of glasses
In recent years, with the increase in the number of people with myopia, glasses have become an indispensable part of many people's lives. However, many people ignore the importance of interpupillary distance when wearing glasses, resulting in discomfort and even vision loss. This article will introduce the measurement method of interpupillary distance in detail, and attach relevant data to help everyone better understand this key parameter.
1. What is interpupillary distance?
Pupillary Distance (PD) refers to the distance between the centers of the pupils of the two eyes, usually in millimeters (mm). Correct interpupillary distance measurement is essential for eyewear comfort and visual performance.
2. Classification of interpupillary distance
The interpupillary distance is divided into single interpupillary distance and binocular interpupillary distance:
| Type | definition | Scope of application |
|---|---|---|
| Single eye interpupillary distance | The distance from the center of the bridge of the nose to the center of the pupil of one eye | Suitable for progressive lenses or special lenses |
| Interpupillary distance of both eyes | The distance between the centers of the pupils of the two eyes | Suitable for ordinary lenses |
3. Measuring method of interpupillary distance
The following are several common interpupillary distance measurement methods:
| method | steps | Things to note |
|---|---|---|
| Professional optometrist measurement | Use a pupillary meter or ruler for precise measurements | The most accurate method, recommended for first-time glasses wearers |
| Self-measurement (ruler method) | 1. Look in the mirror and place the ruler horizontally on the bridge of your nose 2. Close one eye and record the scale corresponding to the center of the pupil of the other eye. 3. Repeat the measurement on the other eye | Keep the ruler level and take the average of multiple measurements. |
| Mobile APP measurement | Download the dedicated APP and follow the prompts to take photos and measure | Convenient but less accurate, suitable for temporary reference |
4. Standard range of interpupillary distance
There are differences in interpupillary distance between different age groups and genders. The following are common interpupillary distance ranges:
| crowd | Interpupillary distance range (mm) |
|---|---|
| adult male | 60-75 |
| adult women | 55-68 |
| Children (6-12 years old) | 50-55 |
5. Consequences of incorrect interpupillary distance measurement
If the interpupillary distance measurement is inaccurate, it may cause the following problems:
1.visual fatigue: The eyes need to constantly adjust their focus and are prone to fatigue.
2.dizziness or nausea: The optical center of the lens does not match the pupil, causing discomfort.
3.decreased vision: Wearing glasses with the wrong interpupillary distance for a long time may aggravate myopia.
6. How to choose suitable interpupillary distance glasses?
1.First time wearing glasses: It is recommended to go to a professional optical shop or hospital for an optometry to ensure accurate interpupillary distance measurement.
2.Online opticians: Provide accurate interpupillary distance data to avoid discomfort caused by measurement errors.
3.Regular review: The interpupillary distance may change with age, and it is recommended to review it once a year.
7. Hot Topic Association
Recently, the topic of "how to wear glasses correctly" has sparked heated discussions on social media. Many netizens shared their experience of wearing discomfort caused by improper pupillary distance measurement, further highlighting the importance of pupillary distance measurement.
Summary
Interpupillary distance is a key parameter that cannot be ignored in the process of wearing glasses. Whether measured by a professional optometrist or by yourself, ensuring the accuracy of your interpupillary distance can significantly improve the wearing comfort and visual effects of your glasses. I hope this article can help everyone better understand the measurement method of interpupillary distance and avoid the discomfort caused by incorrect interpupillary distance.
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