Refraction Determination
Decreased visual clarity isn't always due to fatigue or age. Sometimes the cause lies in how the eye refracts light and forms an image on the retina. Refraction reveals where focusing errors occur and why a person has difficulty seeing into the distance, reading, or working on a screen.
At K+31, we perform refraction determinations, review the results during an appointment, and select a correction only after an in-person evaluation.
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General information
When we recommend an examination
You should schedule an appointment if you experience persistent blurring, eye fatigue, evening headaches, or difficulty reading or working on a computer. A refraction test is performed first, and then the doctor compares the findings with the physical examination.
An examination is most often necessary in the following situations:
- Distant or near vision has worsened
- Headaches, eye strain, or eye fatigue have developed
- Difficulty reading, working on a computer, or driving has become more difficult
- Glasses need to be adjusted or the current correction needs to be replaced
- Blurring persists after visual strain
Similar complaints can have various causes. A prescription is determined after measurements and an in-person evaluation.
Complaints that should not be ignored
A scheduled appointment is appropriate for gradual changes. A sudden deterioration in vision, double vision, pain, eye injury, flashes, severe redness, or a "curtain" sensation require an immediate consultation.
These symptoms are not always associated solely with impaired focusing.
Preventive diagnostics and correction selection
It is beneficial to have regular eye exams, even without significant complaints. The doctor determines the frequency based on the patient's age, workload, chronic diseases, and any prescribed correction. The selection of lenses and glasses begins with measurements, but the doctor also clarifies how the patient sees in everyday life.
Frequently Asked Questions
What does a refraction test reveal?
Do I need to prepare for the test?
How is a refraction test different from a visual acuity test?
How often should this test be performed?
Why it's important not to delay diagnosis and not to choose glasses on your own
Off-the-shelf glasses or an old prescription may temporarily provide a sense of clarity. However, they don't reveal the cause of the changes, the differences between the eyes, or the extent of the problem. Self-selecting glasses often results in fatigue, headaches, or a quick rejection of the correction.
A refraction test with a doctor helps assess more than just the diopters. The specialist assesses how the eye tolerates the correction and whether there is a need for a more extensive examination. Therefore, buying glasses yourself is not a substitute for a medical diagnosis.
References
- The Registry of Clinical Guidelines of the Ministry of Health of the Russian Federation — https://cr.minzdrav.gov.ru/
- The Bulletin of Ophthalmology — https://www.mediasphera.ru/journal/vestnik-oftalmologii
- The Russian Medical Journal, Ophthalmology Section — https://www.rmj.ru/articles/oftalmologiya/
- CyberLeninka, search for "eye refraction" — https://cyberleninka.ru/search?q=%D1%80%D0%B5%D1%84%D1%80%D0%B0%D0%BA%D1%86%D0%B8%D1%8F%20%D0%B3%D0%BB%D0%B0%D0%B7%D0%B0
- EyePress - https://eyepress.ru/
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What is eye refraction and why is it important to determine it?
Refraction of the eye shows how the cornea and crystalline lens refract light. When the focus falls on the retina, a person sees clearly. When the focus shifts, blurriness occurs at a distance or near.
Determining refraction of the eye helps understand why visual acuity has changed, whether there is focusing strain, and how accommodation works.
The doctor evaluates the result along with the patient's complaints, age, workload, and previous glasses or contact lenses. A refraction test is part of a normal ophthalmological examination, not a formal check before a prescription. Therefore, refraction is assessed based on the patient's condition.