Contrast Sensitivity Testing
The eye uses the light reflected from the edges of objects to identify and see them, distinguishing them from the surrounding environment. The basis of the contrast sensitivity test is to assess the eye's ability to detect an object against a background. The closer the color and shape of the target object and the background are to each other, the more difficult it becomes to distinguish between the two.
In this test, various objects are placed against different backgrounds. A decrease in contrast sensitivity (C.S.) is observed in many eye diseases, such as corneal diseases, cataracts, and degenerative retinal diseases.
Decrease in Contrast Sensitivity
Decrease in Contrast Sensitivity can be caused by various factors, including:
- Eye diseases such as cataracts, age-related macular degeneration (AMD), and glaucoma are among the most common causes of visual impairment, especially in older adults
- Brain Injury: It can damage the neural pathways responsible for processing visual information.
- Medications: Certain drugs, such as antidepressants and anti-anxiety medications, can affect contrast sensitivity.
- Age: As we get older, contrast sensitivity naturally declines.
Symptoms of Reduced Contrast Sensitivity:
A decrease in contrast sensitivity can affect daily life, even if visual acuity (sharpness) seems normal. Common symptoms include:
Difficulty seeing in low light – especially at dusk, in fog, or in dimly lit rooms.- Problems with night driving – trouble seeing road signs, lane markings, or pedestrians in the dark.
- Increased sensitivity to glare – discomfort from headlights, sunlight, or reflections.
- Trouble distinguishing objects from similarly colored backgrounds – for example, seeing a white plate on a white tablecloth.
- Difficulty reading – especially printed material with low contrast (e.g., light gray text on white paper).
- Fading or dull appearance of colors – colors may seem less vibrant or washed out.
- Frequent tripping or bumping into objects – due to reduced ability to notice steps, curbs, or obstacles.
- Eye strain or fatigue – especially when focusing for long periods, like reading or working on a screen.
Contrast Sensitivity Test
Contrast Sensitivity Test is a simple and quick method used to evaluate the eye’s ability to distinguish between light and dark areas.
This test is typically performed in an ophthalmologist's or optometrist’s office and usually takes about 10 to 15 minutes.
Benefits of the Contrast Sensitivity Test:
Early Detection of Visual System Deficits
Aid in the Diagnosis and Differentiation of Various Eye Diseases
Assisting in the Selection of Appropriate Treatment
Monitoring Treatment Progress
The Aftab Limited Surgery Center, equipped with advanced technology and experienced staff, offers the following services in contrast sensitivity testing:
Conducting various contrast sensitivity tests: Performed by skilled ophthalmologists.
Precise interpretation of test results: Providing consultation to patients.
Offering suitable solutions: To enhance visual quality and improve contrast system performance.