Is there any special conversion required for contact lens prescription? How to check the degree of blindness? If you usually choose the prescription directly when buying contact lenses, or it is your first time to buy contact lenses, then you must read this article carefully!
The editor will help you answer questions such as whether the degree of contact lenses is the same as that of glasses, how to calculate the degree of contact lenses, whether astigmatism requires special conversion, etc., so that you can master the correct concepts when choosing contact lenses and avoid affecting your vision health due to choosing the wrong degree!
Is the prescription of contact lenses the same as the prescription of glasses? What happens if the contact lenses are not powerful enough?
You can imagine that glasses are worn on the bridge of the nose, a small space away from the eyes, but contact lenses are directly attached to the eyeballs. Will this difference make their powers the same? The answer is of course no!
Because of the difference in position, the power of contact lenses and glasses is actually different, especially when your myopia is high, this difference is more obvious.
Reasons for conversion of contact lens prescription
As mentioned just now, when we wear glasses, there is a distance between the lenses and the eyes, and according toResearchpointed out that it is about 12 mm. This is called the "back distance". This distance will change the light.refractionway, so glasses usually have a darker prescription than contact lenses.
And contact lenses are close tocornea, without this distance, the refraction effect of light is also different, so it is necessary to convert the degree to ensure that you can see clearly after wearing it.
Generally speaking,People with more than 400 degrees of myopia need to convert, while people with lower degrees of myopia have little effect.
The composition of blind eye degree
- Spherical power (SPH):used to correctShortsightedorFarsightedness, negative numbers represent myopia, positive numbers represent farsightedness.
- Astigmatism power (CYL) and axial direction:used to correctastigmatism, axial direction is the direction angle of astigmatism.
Consequences of inappropriate contact lens prescriptions
If the power of the contact lenses is too shallow or too deep, you may feel that your vision is blurred, and you may even have to work hard to see clearly. This may not only easily lead to eye fatigue, but may also cause dizziness or other discomforts.
If you choose a degree that is too dark, your eyes will need extra effort to adjust.focal length, which may have a negative impact on eye health in the long term.
Check out the contact lens prescription calculator here! 1 Let me give you an example!
We have already known before that the power of glasses is usually higher than the power of contact lenses, so how to convert it to find the most suitable contact lens power for you? Here is a simple formula and example to help you understand easily:
Contact lens power = spectacle power ÷ [ 1 – (posterior vertex distance 0.012 × spectacle power)]
This formula may seem a bit complicated, but basically you can refer to the prescription conversion table, or directly ask a professional optometrist for assistance. For example, if your spectacle power is 700 degrees, according to the formula, it is -7.00 ÷ [ 1 – (0.012 × -7.00 )] = -6.46, and the contact lens power will be approximately 650 degrees.
However, this conversion is only for reference.The most accurate way is to have a professional help you determine the degree., to avoid affecting vision and eye health due to inappropriate prescription.
Too lazy to calculate the degree of blindness? Take a quick look at the contact lens prescription comparison chart!
If you find calculating your contact lens prescription a bit troublesome, don’t worry! Here is a simple and clear contact lens power comparison table to help you quickly find the right contact lens power.
You only need to compare the power range of your glasses to easily choose the appropriate contact lens power, eliminating the tedious conversion process, saving you time and effort!
It should be noted that if your myopia degree is between 0 and 375 degrees, there is no need for special conversion, just choose contact lenses with the same degree as your glasses.
400-525 度 | 550-700 度 | 725-850 度 | 875-1000 度 | ||||
隱眼度數 -0.25 | 隱眼度數 -0.5 | 隱眼度數 -0.75 | 隱眼度數 -1.00 | ||||
眼鏡度數 | 隱眼度數 | 眼鏡度數 | 隱眼度數 | 眼鏡度數 | 隱眼度數 | 眼鏡度數 | 隱眼度數 |
-4.00 | -3.75 | -5.50 | -5.00 | -7.25 | -6.50 | -8.75 | -7.75 |
-4.25 | -4.00 | -5.75 | -5.25 | -7.50 | -6.75 | -9.00 | -8.00 |
-4.50 | -4.25 | -6.00 | -5.50 | -7.75 | -7.00 | -9.25 | -8.25 |
-4.75 | -4.50 | -6.25 | -5.75 | -8.00 | -7.25 | -9.50 | -8.50 |
-5.00 | -4.75 | -6.50 | -6.00 | -8.25 | -7.50 | -9.75 | -8.75 |
-5.25 | -5.00 | -6.75 | -6.25 | -8.50 | -7.75 | 隱眼度數 -1.25 | |
-10.00 | -8.75 | ||||||
Have you found your contact lens prescription and can’t wait to put them on?
It is recommended to refer to I-sha monthly disposable colored contact lenses. Each contact lens is not only comfortable to wear, but also adds charm to the eyes, allowing you to enjoy clear vision while showing a charming appearance.
What should I do if I have astigmatism? Just bring in the contact lens prescription astigmatism conversion formula!
When you have astigmatism, don’t worry. First check whether you have astigmatism.Mild astigmatism (such as -0.25 or -0.50 degrees), if so, can usually be corrected by ordinary contact lenses, and no additional power conversion is required.
But ifWhen the astigmatism degree reaches more than -0.75 degrees, or when your myopia degree is about 4 times more than the astigmatism degree, you can consider using the contact lens degree conversion formula, to choose suitable contact lenses. Doing so will help you choose the most appropriate contact lens power to ensure clear and comfortable vision.
Astigmatism contact lens power = glasses myopia power + (astigmatism power ÷ 2)
Suppose your myopia degree is 500 degrees and your astigmatism degree is 50 degrees. Calculate according to the formula: 500 + (50 ÷ 2) = 525 degrees, so you can choose 525-degree contact lenses.
But when the degree of astigmatism exceeds 100 degrees, it is recommended to seek help from professionals, and you may even need to customize special astigmatic contact lenses.
How to choose contact lens prescription dcard? 3 Take the first step to find the right colored monthly throw!
A netizen shared her experience of choosing colored monthly disposable contact lenses on dcard. At that time, she followed the advice of the optical shop clerk and chose the uniform 550 degrees (his left eye was 575 degrees and his right eye was 525 degrees). After a period of time, she found that the power of her left eye was obviously insufficient, so she posted a message asking netizens for their opinions.
Based on this article, the editor has compiled 3 steps for your reference to help you choose suitable monthly disposable contact lenses!
Monthly disposable contact lenses are suitable for long-term wear.If you wear it for a long time every day, it is more appropriate to choose monthly disposable instead of daily disposable.
The water content of monthly disposable lenses is usually around 38%, which helps the lens maintain its shape and provide a comfortable wearing feeling. In addition, the curvature of the lens is also very important. If the curvature is too large or too small, it will affect the wearing comfort.
When choosing colored contact lenses, you also need to pay attention to the tinted diameter of the lens. The larger the diameter, the more obvious the magnification effect will be.
If you are pursuing a natural style, it would be more appropriate to choose a small-diameter colored concealed eye; if you want more visual impact, or to amplify a strong color effect, you can choose a larger diameter.
According to the experience of many netizens,Korean brands of contact lenses are often preferred because they are smaller in diameter and more natural looking.
Don’t forget to consider your daily needs: if you spend long hours in front of a screen, designing or editing, choose aFilter blue lightFunctional contact lenses will be of great help to your eyes.
And if you often engage in outdoor activities, choose resistantUV raysFunctional contact lenses can protect eyes from ultraviolet rays and reduce vision damage.
The method provided by netizens is actually the same as the calculation method mentioned by the editor. Here is a simple summary of the conversion method with or without astigmatism for your reference:
- Contact lens power = spectacle power ÷ [ 1 – (posterior vertex distance 0.012 × spectacle power)]
- Astigmatism contact lens power = glasses myopia power + (astigmatism power ÷ 2)
Various contact lens prescriptions are available!|I-Sha
If your contact lens does not require special customization, and you want to find natural and beautiful monthly disposable contact lenses like dcard netizens, you may wish to consider I-sha The launch of colorful monthly disposable invisible eyes, here are 3 styles recommended for you, each of which has the characteristics of natural beauty, comfort and non-drying:
✦ Base arc BC: 8.6
✦ Lens diameter DIA: 14.2 mm
✦ Coloring diameter G.DIA: 13.1 mm
✦ Moisture content: 38 %
Oriana Monthly Disposable-Shade Brown
Gradient fusion design of three dark and light colors
Show romantic and mysterious attraction
Glossy like the setting sun
The sunset blooms naturally in the eyes
✦ Base arc BC: 8.6
✦ Lens diameter DIA: 14.2 mm
✦ Coloring diameter G.DIA: 12.8 mm
✦ Moisture content: 38 %
Oriana Ariel Monthly Disposable-Gray Ellie Gray
Transparent soft mist color full of watery light
Show the purest and most delicate charm of your eyes
Like a fairy tulle skirt
Exudes pure and fresh dreamy lustrous eyes
✦ Base arc BC: 8.6
✦ Lens diameter DIA: 14.2 mm
✦ Coloring diameter G.DIA: 13.4 mm
✦ Moisture content: 38 %
Oriana Mune Monthly throw-Brown
Dark outer ring X saturated color inner ring
Presents perfect pupil blending effect
Like the bright moonlight and the calm halo reflecting each other
Create deep, lustrous eyes
Compose an unforgettable moonlight overture
I-Sha is a niche brand in Korea with a unique Korean fashion style and potential popularity. It combines its roles as a consumer and a market innovator:
From the perspective of consumers, we look for contact lenses that are most suitable for daily life and have a Korean style. Introducing new products is like recommending your favorite items to friends, sharing the latest popular designs. At the same time, starting from being a market innovator, we allow everyone to discover their own beauty and confidence from the window of the soul, hoping to become a role that consumers trust and an opportunity for transformation.
After reading the above styles, do you feel that each one is just right, natural and with a finishing touch, without overly enlarging the eyes?
If you also want to have such charm, you might as well click the button below to view the styles you are interested in!
How to tell the prescription of contact lenses? ｜FAQ
All the blindness degrees you want are available! |I-Sha
Do you feel that the colored monthly disposable contact lenses on the market in Taiwan cannot meet your needs? More and more beauty-loving Taiwanese people are starting to choose Korean contact lenses because they are natural, comfortable and beautiful. If you cannot go to Korea to buy them in person, or you don’t know which brand to choose, you might as well come here first I-Sha Check out the official website.
The colorful monthly disposable styles we provide are not only natural and comfortable, but also have a good reputation among young people in Korea even though they are a niche brand.
I-Sha
As the exclusive general agent of I-Sha in Taiwan, we have been working in the Korean contact lens market for several years. We are well aware of Taiwanese consumers’ love for the style and design of Korean contact lenses. We are also aware that the current market is hungry for Korean brands with more diversified and everyday styles. Due to the demand, I-Sha obtained the exclusive agency rights in Taiwan.
I for Eye
The founder of I-Sha was inspired by the similar pronunciation of "I" and "EYE" for the brand, which also includes the identity of a professional lens company.
S,H,A
SHA stands for Safety, Healthy, Arrange . As a trusted lens company, we only select the best contact lens products to keep your eyes healthy and beautiful.
Chasing fashion trends is my hobby
Usually I am either unboxing a new product or on the way to unbox it.
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MBTI is ISFJ, and my experience is absolutely reliable (although I often end up spending a lot of money 〒▽〒)
Although I cannot guarantee that everything I share is suitable for you, you can definitely feel my most sincere heart!
