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Eyeglasses are no longer just tools for correcting vision; they now also serve multiple functions such as decoration and protection. Whether you need them to see clearly due to myopia, shield your eyes from UV rays outdoors, or address presbyopia as you age, choosing a suitable pair of eyeglasses is crucial. However, faced with a wide variety of frame styles, lens types, and functional eyeglass products on the market, many people feel confused when making a purchase. This article will provide you with a comprehensive and practical guide to choosing eyeglasses, covering aspects such as functional classification of eyeglasses, selection of core components, and avoidance of common purchasing mistakes, helping you easily select a pair that suits you and boasts excellent quality.
Before purchasing eyeglasses, you first need to clarify your core needs—whether it is to correct vision, protect your eyes, or achieve both. Eyeglasses with different functions have vastly different key points for selection, and blind follow-up purchases can easily lead to unsatisfactory results.
The core function of myopia or farsightedness glasses is to correct refractive errors, allowing light to focus correctly on the retina. Therefore, “accurate optometry” is the first and most critical step in the purchasing process. Many people opt for convenience by ordering glasses online based on the prescription of their old glasses or getting a quick optometry at a street-side shop, but these practices pose significant risks. After wearing old glasses for a period of time, your vision prescription may change, and the lenses may become worn or deformed. Directly using the old prescription will result in poor adaptability of the new glasses. Unprofessional optometry not only fails to accurately measure your current prescription but may also overlook issues such as astigmatism or 不协调 binocular visual function. Long-term wear of such glasses can exacerbate eye fatigue and even cause a rapid increase in vision degree.
It is recommended to undergo optometry at a regular hospital ophthalmology department or a qualified chain optical store. A professional optometry process typically includes steps such as computerized optometry, comprehensive optometer examination, and trial wear adjustment. Some individuals, especially teenagers, may also need to undergo cycloplegic optometry to rule out pseudomyopia and obtain a more accurate refractive prescription. After optometry, you should order glasses based on the data on the prescription, including sphere power, cylinder power, and axis. During the glasses-fitting process, be sure to try them on to check if you can see clearly at both near and far distances, and whether you experience discomfort such as dizziness or eye soreness, ensuring that the lens power is fully compatible with your eyes.
In addition, the selection of lenses for myopia/farsightedness glasses should also take into account your daily eye-use scenarios. If you mainly work or study indoors, ordinary resin lenses are sufficient. If you frequently use computers or mobile phones for extended periods, it is advisable to choose lenses with blue light filtering function to reduce the stimulation of blue light from electronic screens on your eyes and alleviate eye fatigue. If you have a high myopia degree (e.g., over 600 degrees), to make the lenses thinner and lighter for more comfortable wear, you can select lenses with a high refractive index (such as 1.60 or 1.67 refractive index). However, it should be noted that high-refractive-index lenses are relatively more expensive, so you need to make a reasonable choice based on your budget.
Presbyopia is a common vision problem among middle-aged and elderly people, mainly caused by the aging of the lens and the decline in its adjusting ability. It manifests as blurred near vision (e.g., difficulty reading newspaper or phone text). Many middle-aged and elderly people choose to buy ready-made presbyopic glasses at supermarkets or street stalls for convenience and cost-saving. Although these “universal” presbyopic glasses are cheap, they have two major drawbacks: first, the fixed power cannot match each person’s actual presbyopia degree (each person’s presbyopia degree may differ, and there may even be a difference between the two eyes); second, the fixed pupil distance is incompatible. Everyone has a unique pupil distance (the distance between the centers of the two pupils), and mismatched pupil distance can cause problems such as distorted vision, dizziness, and eye soreness when wearing the glasses. Long-term wear can also accelerate eye fatigue and affect eye health.
The correct way to choose presbyopic glasses is similar to that of myopia glasses—optometry is also required first. Professional presbyopic optometry not only measures the presbyopia degree but also adjusts the power based on daily eye-use habits (such as the distance for reading newspapers and whether there is a need to switch between near and far vision). At the same time, the pupil distance is measured to ensure that the optical center of the lens aligns with the center of the pupil. If you need to frequently switch between far vision (e.g., walking, watching TV) and near vision (e.g., reading, using a mobile phone) in daily life, you can also choose progressive multifocal lenses. The upper part of such lenses is used for far vision, the lower part for near vision, and there is a transition area in the middle, eliminating the need to frequently change glasses and making them more convenient to use.
The main function of sunglasses is to block the damage of ultraviolet rays (UVA and UVB) to the eyes and reduce the stimulation of strong light on the eyes, protecting eye tissues such as the retina and lens. However, many sunglasses on the market only focus on appearance design, while their UV protection effect is not up to standard. Wearing such “low-quality sunglasses” can instead harm the eyes—because the lenses will cause the pupils to dilate, and if they cannot block ultraviolet rays, more UV rays will enter the eyes, accelerating the occurrence of eye diseases such as cataracts and macular degeneration.
When purchasing sunglasses, the first thing to pay attention to is the “UV protection level”. Regular sunglasses will be labeled “UV400” or “100% UV Protection” on the lenses or hangtags, indicating that the lenses can block more than 99% of UVA and UVB, which is a standard protection level. Secondly, choose the lens color based on the usage scenario: for daily commuting and shopping, gray or brown lenses are suitable, as they can evenly reduce light intensity without affecting color reproduction. For environments with strong glare reflection such as snowfields and beaches (e.g., skiing, beach vacations), it is recommended to choose dark-colored lenses (such as dark gray or dark blue) or polarized lenses. Polarized lenses can effectively filter reflected light (such as strong light reflected from snowfields or water surfaces), making the field of vision clearer and reducing eye fatigue.
It should be noted that children also need to wear sunglasses. Children’s lenses are clearer, making it easier for ultraviolet rays to penetrate the lenses and damage the retina. Therefore, when choosing sunglasses for children, you should also select products labeled “UV400”, and the lens material should be lightweight and impact-resistant (such as resin lenses). The frame should fit the child’s face to avoid being too loose or too tight.
The core components of eyeglasses are frames and lenses, which not only affect the wearing comfort of the eyeglasses but also determine their durability and user experience. Many people tend to only focus on the appearance of the frame when purchasing, ignoring the material and size, or blindly pursuing high-priced lenses without considering their own needs, resulting in wasting money on unsuitable products.
The material of the frame directly affects wearing comfort and durability. Currently, common frame materials on the market include metal, plate, and TR90. Each material has its own advantages and disadvantages, and you need to choose based on your own needs:
In addition to the material, the size of the frame is also crucial. An inappropriate size will lead to uncomfortable wearing and misalignment between the optical center of the lens and the pupil (affecting the effect of vision correction). When purchasing, you should pay attention to the “pupil distance range” of the frame and ensure that your pupil distance falls within this range (generally, the frame will be marked with the pupil distance range, such as 52-18-140, where 52 is the lens width, 18 is the nose bridge width, and 140 is the temple length). At the same time, you should choose the frame style based on your face shape: people with round faces are suitable for square or rectangular frames, which can modify the facial contour; people with square faces are suitable for round or oval frames, which can soften the facial edges and corners; people with long faces are suitable for frames with a wider horizontal width to shorten the visual proportion of the face; people with heart-shaped faces are suitable for inverted triangular or oval frames to balance the proportion of the forehead and chin.
The selection of lenses directly affects the effect of vision correction and user experience. Lenses on the market can be divided into resin lenses and glass lenses based on material. Currently, resin lenses have become the mainstream because they are lightweight (about half the weight of glass lenses), impact-resistant (not easy to break, with high safety), and have good light transmittance. Although glass lenses have high hardness and slightly better light transmittance, they are heavy and easy to break, which may cause harm to the eyes. Therefore, glass lenses are not recommended unless there are special needs.
Based on resin lenses, you also need to choose specific types according to the following factors:
During the process of purchasing eyeglasses, many people are misled by incorrect concepts, resulting in buying unsuitable glasses. This not only wastes money but may also affect eye health. The following are common purchasing mistakes that you must avoid:
Many myopia patients, worried about an increase in their degree, ask the optometrist to lower the degree, believing that “a lower degree is better for the eyes”. Some people, on the other hand, think that “a higher degree allows for clearer vision” and proactively request to increase the degree. In fact, both practices are incorrect. The degree of myopia glasses needs to fully match the actual refractive degree of the eyes. A degree that is too low will cause the eyes to over-adjust to see clearly, exacerbating eye fatigue and eventually leading to a faster increase in degree. A degree that is too high will cause distorted vision, dizziness, and eye soreness, which also damages eyesight. The correct approach is to order glasses according to the accurate degree provided by the optometrist and ensure clear vision at both near and far distances without discomfort during the trial wear.
Many people believe that the more expensive the sunglasses, the better their protection effect. In fact, the core protective function of sunglasses is “UV protection”. As long as they are labeled “UV400”, even mid-to-low-priced products can achieve a qualified protection effect. High-priced sunglasses mainly have advantages in brand, design, and lens materials (such as polarization and photochromism), but their protection effect is not necessarily better. In addition, the darkness of the lens color has nothing to do with the UV protection effect. Excessively dark colors will instead cause the pupils to dilate, and if the lenses cannot block UV rays, more UV rays will enter the eyes. When choosing sunglasses, as long as they have the “UV400” label, the color should be such that you can see objects clearly without affecting color judgment.
The degree of presbyopia will gradually increase with age, and it is generally necessary to re-undergo optometry and adjust the degree every 3 to 5 years. Many middle-aged and elderly people wear a pair of presbyopic glasses for many years and are reluctant to replace them even when their vision becomes blurred, believing that “it’s okay as long as they can barely see”. This practice will cause the eyes to be in a state of fatigue for a long time, which may accelerate the increase in presbyopia degree and even cause discomfort such as headaches and eye soreness. It is recommended to check the presbyopia degree regularly (every 1 to 2 years) and replace with suitable presbyopic glasses in a timely manner.
Choosing a suitable pair of eyeglasses is actually not complicated; you just need to remember the following three steps:
Eyeglasses are “companions” that accompany us in daily eye use. Choosing the right pair of eyeglasses not only allows for clearer vision but also protects eye health. It is hoped that this purchasing guide can help you avoid mistakes and select a pair of eyeglasses that suits you and has excellent quality, making every moment of seeing the world easy and clear.
