How To Buy Contact Lenses?

Nowadays, more and more people are giving up their bulky frames for contact lenses for the sake of their image. However, there are many misconceptions about the selection and daily wear of contact lenses, which can sometimes cause discomfort, dry eyes, vision loss, and even eye infections. What are the issues that need attention?

People who are not suitable for wearing contact lenses

The following groups of people are not suitable for wearing contact lenses.

First, patients with poor eye health conditions such as high eye pressure, severe dry eyes, infectious conjunctivitis, or patients with systemic diseases such as diabetes are not suitable for wearing contact lenses; Second, poor compliance, is not a good choice for contact lenses.

Secondly, people who have poor compliance, do not pay attention to personal hygiene and cannot consciously check their eye condition regularly.

Third, people with allergies, especially those who are allergic to lens materials and care product components.

Fourth, for people who live and work in an environment where they are constantly exposed to sand and volatile chemicals, wearing contact lenses may increase the probability of eye damage.

In addition, middle and high school students who are still developing can also wear contact lenses, such as OK lenses, which are specially designed high-oxygen permeable rigid contact lenses that doctors will instruct teenagers to wear to control the rate of myopia development. Other teenagers may choose contact lenses because they are not suitable for wearing frames due to the large difference in the refractive status of their eyes. But it should be noted that try not to wear contacts, the oxygen permeability of contacts is relatively poor, and the quality of contacts on the market varies, easy to buy substandard products.

Choose the right contact lenses and pay attention to the parameters

The people who are suitable for wearing contact lenses must choose a regular product when buying the product, and also need the choice of product parameters.

The first is that the degree of contact lenses must be accurate. If the degree is not appropriate, long-term wear may affect the health of vision. In the case of astigmatism, if the astigmatism is not high, you can use regular spherical contact lenses, but if the astigmatism is too high, it is better to customize the contact lenses with an astigmatism design.

It is important to note that the prescription of frame glasses is known, and you should not buy contact lenses directly based on the known prescription. Because frames are worn on the bridge of the nose, there is a certain distance between them and the cornea, called the lens-eye distance, and frame prescriptions differ from contact lenses worn directly on the cornea. Contact lens prescriptions need to be converted on the basis of frame lens optometry.

Next is the base arc of the lens. The base arc is the radius of curvature of the lens, the size of the base arc, and the steepness of the inner surface of the lens, the smaller the base arc is steeper, the tighter it will be in the eye. The smaller the base arc, the steeper it will be and the tighter it will be in the eye. If the base arc is not appropriate, it will reduce wearing comfort, so the size of the contact lens base arc needs to be chosen based on corneal curvature measurement parameters.

In addition, oxygen permeability and water content are two parameters that should not be ignored. The better the oxygen permeability, the more the cornea will be able to “breathe comfortably”. Usually, the thinner the lens, the better the oxygen permeability, and the higher the water content, the higher the oxygen-carrying capacity, but because it needs to keep the lens moist, it will draw moisture from the eye, causing dryness. Therefore, both parameters need to be taken into account, and different people need to evaluate their own situation and choose under the guidance of a medical professional.

Finally, in terms of comfort and safety, lenses with shorter disposable cycles are cleaner and less likely to cause eye infections.

Daily care of contact lenses

First, contact lens cases and tools should be disinfected and replaced regularly, and hands should be cleaned when wearing and removing them.

Secondly, contact lenses must be removed during swimming, bathing, and sleeping, otherwise, there is a risk of eye infection. Also, you should disinfect your lenses with a care solution after removing them.

Third, try not to wear them for more than 8 hours at a time, and pay attention to the discard cycle, so that the lenses do not overstay their usefulness and are replaced regularly.

Fourth, if there are symptoms such as dry eyes, you can use artificial tears without preservatives, if the discomfort is serious, you need to take them out and seek medical attention.

Fifth, remember to go to the hospital for regular eye health checks.

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