Not everyone is suitable for LASIK, however. An ophthalmologist needs to evaluate your eyes and prescription first to determine whether laser vision correction is appropriate and safe for you.

For anyone who wants to understand what they may encounter during a LASIK suitability assessment, this guide provides a closer look at the process.

What Is a LASIK Assessment?

A LASIK assessment, also known as a pre-operative suitability assessment, is a detailed eye examination performed to determine whether your eyes are suitable for laser vision correction.

The assessment looks at factors such as your prescription, corneal shape and thickness, tear film and overall eye health. These measurements also help the surgeon determine which procedure, if any, may be appropriate for your eyes.

A LASIK assessment is not a commitment to surgery. Instead, it is an opportunity to gather the information needed to determine whether the procedure is suitable for you and discuss the potential benefits, limitations and alternatives.

Who Is Eligible for Eye LASIK Singapore Procedures?

There is no single checklist that guarantees LASIK eligibility. Your surgeon will assess several factors before recommending the procedure.

Some commonly considered factors include:

• Age: LASIK is generally considered for adults. While the FDA minimum age for some LASIK procedures is 18, vision is more likely to have stabilised after 21, and individual clinics may have their own criteria.

• Stable prescription: Your spectacle or contact lens prescription should have remained reasonably stable, commonly for at least one year. Shinagawa, for example, states that candidates should have stable spectacle power for at least one year.

• Suitable prescription: The type and degree of refractive error must fall within the range that can be treated safely by the particular procedure and laser system.

• Healthy corneas: The corneas need to have suitable thickness and shape. Conditions such as keratoconus or certain corneal abnormalities may make LASIK unsuitable.

• Overall eye health: Conditions such as significant dry eye, certain corneal diseases, uncontrolled glaucoma or cataracts affecting vision may affect whether LASIK is appropriate.

• Pregnancy and breastfeeding: LASIK is generally deferred during pregnancy and breastfeeding because hormonal changes can temporarily affect refraction and the ocular surface.

Your surgeon will consider these factors together rather than relying on any single measurement.

What Tests Happen During a LASIK Assessment?

A LASIK assessment involves several eye measurements and examinations. The exact tests performed can vary depending on the clinic and your individual circumstances, but they are generally non-invasive.

1. Visual acuity and refraction testing
   These tests assess how clearly you can see and determine your refractive error. Your existing prescription may also be reviewed, particularly if you have records of previous measurements.
   
   

2. Corneal mapping and thickness measurement
   Corneal topography or tomography can create detailed maps of the cornea, while pachymetry measures its thickness. These measurements are important because LASIK reshapes the cornea, and the surgeon needs to assess whether the cornea is suitable for treatment.
   
   

3. Tear film and dry eye evaluation
   The ocular surface and tear film may be assessed because dry eye can affect both the accuracy of pre-operative measurements and recovery after refractive surgery.
   
   

4. Eye pressure measurement or tonometry
   This measures the pressure inside the eye and can help screen for conditions such as glaucoma.
   
   

5. Eye health examination
   Your surgeon may examine the front and back of the eye, including the cornea, lens, retina and optic nerve. Depending on your history and examination findings, additional tests or a dilated eye examination may be performed to identify conditions that could affect your suitability for surgery.

Together, these tests provide a more complete picture of your eye health and help the surgeon determine whether LASIK is appropriate.

How Long Do LASIK Assessments Take?

The length of a LASIK assessment varies depending on the tests required and the individual patient. A comprehensive evaluation may take several hours when multiple measurements and examinations are performed.

If your eyes are dilated as part of the assessment, you may experience temporarily blurred vision and increased sensitivity to light afterwards. For this reason, it can be sensible to arrange transport home rather than planning to drive yourself.

Your clinic should be able to advise you beforehand about how long your particular assessment is expected to take and whether you need to make any arrangements afterwards.

Do LASIK Assessments Hurt?

LASIK assessments are generally not painful. Most of the tests involve looking into instruments, reading an eye chart or having measurements taken from the surface of the eye.

Some tests may cause brief discomfort. For example, tonometry can involve a momentary sensation of pressure or contact, depending on the method used.

The assessment itself does not involve the corneal flap or laser treatment used during LASIK surgery, so there are no surgical incisions involved in the assessment.

What Happens After the Assessment?

Once the assessment is complete, your ophthalmologist can review the results with you and discuss whether LASIK is suitable.

If you are a candidate, your surgeon can explain the procedure, expected outcomes, potential risks and aftercare requirements. The assessment may also help determine which type of refractive procedure is most appropriate for your eyes.

If LASIK is not suitable, that does not necessarily mean that no form of vision correction is possible. Depending on the reason, your doctor may discuss alternatives such as PRK or other refractive options, or recommend continuing with glasses or contact lenses.

Ultimately, a LASIK assessment is the starting point for an informed discussion about your vision. It does not commit you to surgery; instead, it gives you and your ophthalmologist the information needed to decide whether laser vision correction is appropriate for your eyes.