Eye Test

Visual Acuity Test

Visual acuity test measures how clearly your eyes can see at a specific distance. This test is used to diagnose refractive errors such as myopia, hypermetropia, and astigmatism, as well as eye diseases like macular degeneration, cataracts, and glaucoma.

Visual Acuity Test

Visual acuity test measures how clearly your eyes can see at a specific distance. This test is used to diagnose refractive errors such as myopia, hypermetropia, and astigmatism, as well as eye diseases like macular degeneration, cataracts, and glaucoma.

Visual acuity test is performed by an eye doctor in a clinical setting. The test proceeds as follows:

⬩The patient sits or stands 6 meters away from an eye chart.

⬩The doctor measures each eye separately by covering one eye at a time.

⬩The eye chart consists of rows of letters or symbols, starting with large ones and getting smaller in each subsequent row.

⬩The patient reads aloud the letters or symbols they can see from each row.

⬩The doctor records the smallest row the patient can read.

Visual acuity is expressed as a fraction of two numbers. The first number represents the distance at which the patient can see, and the second number represents the standard viewing distance (4-6 meters). People with visual acuity disorders may be offered options like glasses, contact lenses, or surgical treatments.

Color Blindness Test

Color blindness, also known as daltonism, is a visual impairment where the eyes struggle to perceive certain colors or shades. The most common type of color blindness is red-green color blindness, which makes it difficult to distinguish between red and green colors.

Color blindness test is a series of diagnostic methods used to evaluate an individual's ability to perceive colors. These tests measure whether a person can correctly identify specific colors or distinguish between different shades.

⬩The Ishihara test uses circles with dot patterns. Colorblind individuals may see different numbers or letters in these patterns or see nothing at all.

⬩Anomaloscopy tests measure a person's color perception by mixing colors and asking them to identify the resulting color.

⬩Pseudoisochromatic plates tests use plates with dots that show different numbers or shapes to those who are colorblind.

⬩The Lantern test is used to evaluate night vision and involves a device with different colored lights.

Color blindness tests are performed in a well-lit room, and each eye is tested separately. The doctor shows a series of colored shapes or patterns and asks how the patient sees them. For treating color blindness, contact lenses and special glasses can help individuals better distinguish colors.

Amsler Grid Test

The Amsler Grid test is used to diagnose diseases that affect the central vision, such as macular degeneration. It uses a simple grid of lines. The doctor tests each eye separately.

The patient checks if the lines appear straight or if any area looks distorted, blurry, or dark.

Visual Field Test

Visual field test determines how much of the surroundings you can see without moving your eyes. It helps evaluate how the brain processes signals from the optic nerves. It is used to diagnose diseases that can narrow the visual field, such as glaucoma, retinitis pigmentosa, and brain tumors. The test is performed by an eye doctor using a special device.

Duochrome Test

Duochrome test is an eye test used by eye doctors to diagnose color aberration and short-wavelength myopia. The test is conducted as follows:

⬩The patient is asked to cover one eye.

⬩A red and green background illumination is provided to the open eye.

⬩Different-sized letters or symbols are presented on both backgrounds.

⬩The patient is asked to identify which letters or symbols they can see more clearly on each background.

By comparing the clarity of the letters or symbols on the red and green backgrounds, the ability to see clearly in both colors is evaluated.