When visiting an eye doctor or optician, the patient ultimately receives a paper containing numbers and symbols that may seem complicated and incomprehensible at first glance. This paper is known as a prescription for eyeglasses or lenses, and it is the essential key to achieving clear and comfortable vision.
Many people rely solely on the optician's office without trying to understand what these numbers mean, but knowing the basics of a prescription gives you greater awareness of your eye health and helps you choose the most suitable glasses or lenses for you.
In this simplified guide, we will explain the components of the prescription step by step, in easy and clear language.
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What is the prescription for eyeglasses?
A prescription is a document issued by an ophthalmologist after an eye exam. It contains precise measurements that determine the lens strength required to correct vision. These measurements vary depending on the individual's eye condition, such as nearsightedness, farsightedness, astigmatism, or age-related vision loss.
Ingredients of a prescription for eyeglasses
A prescription usually consists of several boxes, each box having a specific meaning:
First: The right eye and the left eye
The measurements are recorded for each eye separately, because the strength of vision may vary from one eye to the other.
The right eye is written on one line, and the left eye on another line.
Second: Spherical strength (SPH)
Spherical strength indicates the degree of nearsightedness or farsightedness.
- If the number is preceded by a negative sign, this indicates nearsightedness.
- If the number is preceded by a positive sign, this indicates farsightedness.
The higher the number, the greater the degree of vision impairment.
Third: Astigmatism (CYL) power
This box is used to correct astigmatism, a condition resulting from an irregularity in the surface of the cornea.
- A numerical value is recorded indicating the amount of distortion.
- If there is no astigmatism, this box may be left blank.
Fourth: The astigmatism axis (axis)
The astigmatism axis determines the direction of distortion correction within the eye.
- It is measured in degrees
- It ranges between zero and one hundred and eighty degrees
- It is only written if there is astigmatism.
This number is very important to ensure lens accuracy and clarity of vision.
Fifth: Adding reading
Reading supplement is commonly used for people who experience near vision impairment with advancing age.
- Added to the basic power of vision
- Used in multifocal glasses or reading glasses
- Its value is always positive.
What is the difference between reading glasses and regular eyeglasses?
Reading glasses are used only for close work such as reading or using the phone, while regular eyeglasses may be for distant vision, near vision, or both, depending on the prescription.
Why do prescriptions differ from person to person?
Each eye has its own characteristics, such as the shape of the cornea, the length of the eye, and the strength of the muscles, so someone else's prescription cannot be used even if the symptoms are similar.
Does the prescription change over time?
Yes, the recipe may change over time as a result of:
- aging
- eye strain
- Using screens for extended periods
- Eye condition development
Therefore, it is advisable to have a regular eye exam.
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The importance of understanding the prescription when buying glasses
Understanding the prescription helps you to:
- Choosing the right lens
- Make sure the recipe is followed correctly
- Avoid common mistakes
- Communicate better with your optician
Summary
A prescription isn't just a collection of random numbers; it's a precise blueprint for clearer vision and a more comfortable daily life. Understanding what these numbers mean gives you confidence when choosing your glasses or contact lenses and ensures the best possible outcome.
Frequently Asked Questions – Arabic Article
1. Can I use the same recipe for more than one pair of glasses?
Yes, as long as the vision measurements do not change.
2. Is the prescription valid for life?
No, it needs to be updated periodically.
3. Does adding reading mean poor eyesight?
It is a natural part of aging.
4. Can the astigmatism axis be ignored?
No, because it is essential for clear vision.
5. Does the prescription differ for glasses and contact lenses?
Yes, they differ in some measurements.
6. Do large numbers indicate severe vision impairment?
Often yes, but it varies from case to case.
7. Can glasses be purchased without a prescription?
This is not recommended.
8. Does the recipe change because of using the phone?
Excessive use may have an effect over time.
9. How often should eyesight be checked?
Once a year or as recommended by the doctor.
10. Is the same prescription suitable for prescription sunglasses?
Yes, with the selection of suitable lenses.