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What is a refraction test?

An eye refraction test, also known as a refraction exam or refraction assessment, is a common procedure performed by optometrists or ophthalmologists to identify the correct prescription for corrective lenses which includes eyeglasses or contact lenses. The test helps in determining the refractive eye error, in which the eye's natural focusing ability is impaired. This impairment can cause blurry vision and difficulty in focusing on objects at different distances.

Why is the refraction eye test used?

The refraction eye test is used to determine if the patient requires prescription lenses including what kind of prescription is needed to see properly. The test results are useful in diagnosing the following conditions:

  • Myopia, also referred to as nearsightedness 
  • Presbyopia is a condition linked to age and causes focus issues in the eye lens 
  • Astigmatism is a refractive issue linked to eye shape lens, that causes blurry eyesight 
  • Hyperopia also referred to as farsightedness 
  • Macular degeneration, a condition linked to age factor affecting the sharp central eyesight of the patient 
  • Retinal vessel occlusion is a condition causing a blockage in small blood vessels near the retina 
  • Retinitis pigmentosa, a rare hereditary condition damaging the retina 
  • Retinal detachment is a condition in which the retina detaches itself from the rest of the eye

Who should get tested for the refraction test procedure?

According to healthcare professionals, everyone must undergo a refraction test frequently along with other eye tests. It benefits in diagnosing and treating eye conditions, some of which are without symptoms. One must get a refractive eye test if: 

  • Experiencing vision issues 
  • Regularly wear contact lenses or prescription glasses 
  • Above the age of 60 years 
  • Diabetic people 
  • Family history of refractive errors

What happens during the refractive eye test procedure?

An ophthalmologist starts by measuring the vision of a patient during a refraction eye test procedure and identifies the correct prescription for corrective lenses like contact lenses or glasses. Here are some of the steps followed during the refraction test: 

  • Preliminary assessment: In this step, the doctor begins by asking questions related to vision issues and changes that are observed. It includes inquiring about the clinical history and any current eye conditions. 
  • Visual Acuity Test: This test is useful in viewing letters or symbols on a standardized eye chart at several distances. The patient is asked to read the text with each eye or both eyes. It is beneficial in determining visual acuity. 
  • Objective Refraction: The eye physician might involve the use of an instrument known as a retinoscope for obtaining the initial assessment of refractive error. It helps in providing an objective measurement of the eye’s focus efficiency by evaluating the light reflected off the patient’s retina. 
  • Astigmatism Assessment: If the patient has astigmatism, there is a test known as cylinder axis measurement which might be performed. It is helpful in determining the astigmatism magnitude and angle so that the prescription can involve correction in terms of distortion caused by a cornea or lens that is irregularly shaped. 
  • Near Vision Testing: Once the distance vision prescription has been determined, the physician will perform near vision testing. It includes the use of a smaller chart or reading material for assessing the efficiency of eyesight. 
  • Final Prescription: After all the required tests are done, the doctor will involve assessing the data and determining the final prescription. The doctor will recommend the particular lend power to the patient for each eye. The eye physician might also recommend options for additional vision correction or discuss any problems linked to eye health.

Why should you choose The Calcutta Medical Research Institute for refraction eye test procedure?

The Calcutta Medical Research Institute is among the top multi-special hospitals in northeastern India. It is also known as the flagship of CK Birla Hospitals. It’s been more than 50 years since the hospital has been offering unmatchable healthcare services to its patients. Our three principles which are ethical conduct, patient centricity, and clinical excellence have assisted us in gaining national and global repute. The incorporation of highly-skilled and qualified professionals ensures delivering holistic care to the patients. We are one of the NABH and NABL accredited hospitals in India known for our well-known quality healthcare service delivery. So, if you or any member of your family are looking for refraction eye testing, we are your go-to solution. All you need to do is book an appointment when seeking eye treatment or directly visit us and our expert doctors will take it forward once you get connected.


How much does a refraction test cost?

The cost for the refraction test depends on the healthcare services, however, the average cost begins from INR 100-2500. There are certain factors that might affect the test results such as the severity of the condition.

How accurate is the refraction test?

Refraction test is usually accurate and after receiving the results, the doctor can prescribe the correct prescription for lenses like eyeglasses or contact lenses.

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