Most people come for an eye check-up when their vision becomes blurry, when they can’t read clearly, or when their glasses number changes. But many eye conditions start way before vision actually changes. By the time a person may notice signs of vision loss, the condition has already progressed. In reality, one of the biggest misconceptions about eye health is that good eyesight does always mean healthy eyes.
This is why routine advanced eye testing is very important. Earlier, a check-up commonly included checking vision using an eye chart. Today, testing facilities have become much more detailed and technology-driven. We now have imaging and functional exams that scan the inside of the eye, study the retina and optic nerve, measure side vision, and detect early changes. Modern eye tests today allow us to detect vision conditions sometimes even before the patient notices any signs and symptoms.
Timely Intervention Can Save Your Eyes
There are several eye conditions where vision is impacted slowly and silently, such as:
- Glaucoma
- Optic nerve damage
- Macular Degeneration
- Diabetic Retinopathy
- Retinitis Pigmentosa
- Peripheral vision loss
- Stargardt
In many of these conditions, the patient may still read the eye chart clearly, but the damage has already started happening inside the retina or optic nerve. That is why advanced diagnostic tests are not just for people with low vision — they are also for early detection and prevention.
OCT (Optical Coherence Tomography)
OCT is a scanning test that takes very detailed images of the retina and optic nerve. It is similar to a CT scan or MRI, but designed for the eye. It displays the individual layers of the retina and measures the thickness of the optic nerve fibers.
The test is very simple, painless, and quick. The patient sits in front of the machine and places their chin on the rest provided. They are asked to look at a small light inside the machine with one eye first. The machine scans that eye using light waves and captures images. This process is repeated for the other eye. The test usually takes only a few minutes.
The OCT report shows:
- Thickness of retinal layers
- Optic nerve fiber thickness
- Macular thickness
- Areas of retinal swelling
- Areas of retinal thinning
- Early optic nerve damage
- Early glaucoma changes
- Macular degeneration changes
- Diabetic retinal changes
Sometimes a patient’s vision may still be normal, but the OCT report may show thinning, which helps detect vision changes and vision loss at a very early stage. OCT is extremely useful for glaucoma, optic neuropathy, macular degeneration, diabetic retinopathy, and retinal diseases.
Visual Field Test (Perimetry)
A visual field test measures your side vision. It checks how much area a person can see when looking straight ahead. This test is very important because many eye conditions affect side vision first.
During the test, the patient sits in front of a dome-shaped machine and looks at a central point. Small lights appear in different areas inside the dome, and the patient has to press a button whenever they see a light. The machine then maps which areas the patient can see and which areas they cannot see clearly. The duration of the test depends on the patient. If there are any preexisting eye conditions a person may take longer to do the test.
The report shows:
- Side vision sensitivity
- Areas of vision loss
- Blind spots
- Peripheral vision defects
- Central vision defects
- Progression of vision loss over time
This test is very important for:
- Glaucoma
- Optic nerve damage
- Retinitis pigmentosa
- Brain-related vision problems
- Neurological conditions
- Optic neuritis
- Tumors affecting visual pathways
Sometimes patients can read 6/6 on the eye chart but may have significant side vision loss, which can only be detected through this test.
Retina Photography / Fundus Imaging
Retina photography involves taking detailed photographs of the inside of the eye. It covers the retina, blood vessels, and optic nerve. These images help in tracking the condition of the retina and optic nerve and comparing changes over time.
The patient sits in front of a camera-like machine and looks at a light. The machine takes photographs of the retina. At times eye drops may be used to dilate the pupil so that more accurate images can be taken. The test is quick and painless.
Retina images help detect:
- Diabetic retinopathy
- Retinal bleeding
- Macular degeneration
- Optic nerve swelling
- Optic nerve pallor
- Retinal degeneration
- Retinal holes or tears
- Blood vessel changes
- Hypertension-related retinal changes
The biggest advantage of retina photography is that we can store images and compare them year after year to monitor progression.
| Test | What it checks |
| OCT | Structure of retina and optic nerve |
| Visual Field Test | Functional vision and side vision |
| Retina Imaging | Retina and optic nerve appearance |
| Vision Test | Clarity of vision |
Should I Get Tested For My Vision?
These tests are especially important for:
- People above 40 years
- People with diabetes
- People with high spectacle number
- Family history of glaucoma
- Optic nerve problems
- Retinal diseases
- Gradual vision loss
- Sudden vision changes
- Head injury patients
- People on long-term medication
- People with neurological conditions
Apart from the specific groups, eye tests are not only for people who already have signs, pre-existing conditions or any vision problems. In fact, the team at Sanjeevan, recommend these tests for people who feel their vision is “not as before” even though their glasses number has not changed much. This could include people who feel eye strain while using screens, people who feel their vision is unclear, people who have difficulty driving at night, or people who feel their vision takes time to focus. These tests are not only for people who cannot see — but also for people who want to maintain their vision so they continue to see well in the future.
Do not wait for vision to reduce to test your eyes.
Test your eyes so that vision does not reduce.