Prior to LASIK vision correction surgery, ourprofessionals will perform a comprehensive eye exam to ensure that you are a good candidate for treatment. The pre-LASIK vision correction evaluation ( LASIK CONSULTATION & PRE LASIK SAFETY TESTS) should include:
• Visual Acuity Testing : An eye examination that determines sharpness of vision, typically performed by identifying objects and/or letters on an eye chart.
• Refraction : Refraction is the bending of light as it passes from one substance to another. Here, the light ray passes from air to glass and back to air. The bending is caused by the differences in density between the two substances.
• Keratometry (measurement of corneal curvature):Keratometry is the measurement of the anterior corneal curvature and is traditionally performed with a manual keratometer. This device, also known as an ophthalmometer, was developed by von Helmholtz in 1880. It is an instrument that gives 2 corneal curvature values (maximum and minimum) 90 degrees apart.
• Slit Lamp Examination:The slit-lamp examination looks at structures that are at the front of the eye.The slit-lamp is a low-power microscope combined with a high-intensity light source that can be focused to shine in a thin beam.
• Pupillary measurements :Pupillary Distance (PD) or interpupillary distance (IPD) is the distance (the industry standard is to measure in millimeters) between the centers of thepupils in each eye. This measurement is used when preparing to make prescription eyeglasses.
• Tear Film Analysis : The tear film is the most anterior refractive surface of the eye. Its stability plays an important role in the condition of vision from the optical viewpoint. A simple calculation illustrates the optical importance of the tear film in the imagery of an individual eye
• Glaucoma Testing :Glaucomais an eye disorder in which the optic nerve suffers damage, permanently damaging vision in the affected eye(s) and progressing to complete blindness if untreated. It is often, but not always, associated with increased pressure of the fluid in the eye (aqueous humour).
• Pachymetry (measurement of corneal thickness) : It is used to perform Corneal pachymetry prior to LASIK surgery, for Keratoconusscreening, LRI surgery and is useful in screening for patients suspected of developing glaucoma among other uses.
• Detailed Retinal Evaluation with Dilatation : A healthy retina is critical to your vision and needs to be examined for such problems as macular degeneration,glaucoma, retina holes, retinal detachments, and complications from high blood pressure and diabetes.
• Corneal Topography : Corneal topography,also known as photokeratoscopyor videokeratography, is anon-invasivemedical imagingtechnique for mapping the surface curvature of thecornea, the outer structure of theeye. Since the cornea is normally responsible for some 70% of the eye’srefractive power,its topography is of critical importance in determining the quality of vision.
• FACT (Low contrast Visual Acuity) :The Functional Acuity Contrast Test (F.A.C.T. ®) is widely recognized as the most relevant low-contrast visual acuity test available. By testing the patient’s ability to detect contrast, F.A.C.T.® is able to measure a relevant aspect of vision largely overlooked by conventional visual acuity.
• Aberrometry Test : Aberrometry measures the way a wavefront of light passes through thecorneaand the crystallinelens, which are the refractive (light focusing) components of the eye. Distortions that occur as light travels through the eye are called aberrations, representing specific vision errors.
• Pentacam Test :The pentacam provides you with an overall view of the anterior segment of the eye in two Seconds. automatic measurements activation with quality test guarantees fast, reproducible and delegable measurements.
• History Taking
For your own safety we request you to not self-drive home after the tests as the vision may be slightly blurry for a couple of hours.