Many eye diseases develop gradually and may not cause noticeable symptoms during their early stages. Detailed imaging of the retina and optic nerve can help ophthalmologists identify subtle structural changes, monitor disease progression and evaluate response to treatment. Optical Coherence Tomography, commonly known as OCT, is an advanced, non-invasive imaging test that produces high-resolution cross-sectional images of structures inside the eye. Apollo Adlux Hospital, Kochi, uses OCT as part of comprehensive ophthalmic and neuro-ophthalmic evaluation.

What Is an OCT Eye Scan?

Optical Coherence Tomography uses reflected light waves to create detailed images of the retina, macula and optic nerve. The retina is the light-sensitive tissue located at the back of the eye. The macula is the central area of the retina responsible for sharp, detailed vision. OCT allows doctors to examine the individual layers of these structures and measure their thickness. The test is sometimes compared to an optical biopsy because it provides detailed images of tissue layers without requiring an incision or removal of tissue.

Why Is an OCT Scan Performed?

An OCT scan may be recommended when a patient experiences:

•            Blurred or distorted vision
•            Sudden or gradual loss of vision
•            Difficulty reading or recognising faces
•            Dark spots or blank areas in the field of vision
•            Changes related to diabetes
•            Raised eye pressure
•            Suspected optic nerve damage
•            Unexplained visual symptoms

It may also be included in the routine monitoring of patients with known retinal or optic nerve disorders.

Eye Conditions Detected or Monitored Through OCT

Glaucoma

Glaucoma can damage the optic nerve and cause permanent vision loss. OCT helps measure the retinal nerve fibre layer and evaluate structural changes around the optic nerve.

Diabetic Retinopathy and Diabetic Macular Oedema

Diabetes may damage the small blood vessels of the retina. OCT can detect retinal swelling and fluid accumulation associated with diabetic macular oedema.

Age-Related Macular Degeneration

OCT imaging can identify changes affecting the macula, including fluid, abnormal deposits and disruptions within retinal layers.

Macular Hole

A macular hole is a small opening in the central retina. OCT helps confirm the diagnosis, determine its stage and support treatment planning.

Epiretinal Membrane

An epiretinal membrane is a thin layer of tissue that develops over the macula and may distort vision. OCT can demonstrate the degree of retinal traction or distortion.

Retinal Vein Occlusion

A blockage in a retinal vein may result in bleeding and swelling. OCT helps assess macular oedema and monitor treatment response.

Optic Nerve and Neuro-Ophthalmic Conditions

OCT may provide useful information in the evaluation of optic neuritis, optic nerve compression and selected neurological conditions that affect the visual pathway.

What Happens During an OCT Test?

The patient sits in front of the OCT machine and rests the chin and forehead on the provided supports. The technician asks the patient to focus on a target while the device captures images.

The procedure is:

•            Non-invasive
•            Generally painless
•            Quick to perform
•            Free from ionising radiation
•            Usually completed without physical contact with the eye

In some cases, eye drops may be used to dilate the pupils. Dilated vision may remain blurred or sensitive to light for a few hours.

Can OCT Detect Eye Disease Early?

OCT may identify structural changes before a patient notices significant vision loss. However, OCT results must be interpreted along with the patient’s symptoms, eye examination, visual field testing, eye pressure and other relevant investigations. It is not a replacement for a complete ophthalmic examination.

Who Should Consider an OCT Eye Test?

An ophthalmologist may recommend OCT for:

•            People with diabetes
•            Patients with glaucoma or raised eye pressure
•            Individuals with a family history of glaucoma
•            Older adults at risk of macular degeneration
•            Patients receiving treatment for retinal disease
•            People with unexplained changes in vision
•            Patients with suspected optic nerve disorders

The frequency of testing depends on the diagnosis and the ophthalmologist’s recommendation. Apollo Adlux Hospital provides advanced OCT imaging as part of integrated eye and neuro-ophthalmic care. Access to detailed imaging enables specialists to correlate structural findings with clinical symptoms and plan appropriate monitoring or treatment. For patients looking for an OCT scan in Kochi, Apollo Adlux Hospital offers advanced diagnostics within a comprehensive multispeciality setting.