The different types of eyesight tests. | Plano Eye Health

The different types of eyesight tests

To take care of your eyes and detect any possible eye conditions early, it is vital to go for a regular eye examination. A regular eye examination entails more than simply vision correction and prescription of spectacles or contact lenses. Rather, a comprehensive eye examination investigates your overall eye health for vision-threatening conditions such as glaucoma, cataracts and macular degeneration. Below are the main types of eyesight tests done during a comprehensive eye examination, that assess your eye health and vision.

eyesight tests


#1: Visual acuity test

You would probably be familiar with this test already, as it involves the “eye chart”. Your eye care professional may ask you to identify the letters shown on a chart. As your eyes move down the chart, the lines and letters shrink in size and your job is to cover one eye and read whatever you see aloud, and do the same for the fellow eye.

#2: Refraction

Refraction alludes to the process by which light waves are bent or refracted as they enter your cornea (transparent layer protecting your eye) and lens (responsible for the focusing mechanism) of your eyes.

Your eye care professional may perform a refraction test to see if you require vision correction like glasses or contact lenses. The refraction results are then used to determine the optimal corrective lens prescription to provide you with the clearest vision. During a refraction, your eye care professional will ask you to compare various lenses and determine which lens makes your vision clear.

#3: Colour vision test

This test evaluates your eyes for color blindness and colour vision deficiencies. You would be tested on your capacity to differentiate colours by identifying a number or letter within an image of multicolored circles. A common colour vision test would be the standard Ishihara colour plate test.

#4: Eye pressure

This test measures the pressure inside your eye, or intraocular pressure. Non-contact tonometry is the most prevalent type of eye pressure test in which a tonometer blows a gentle puff of air into your eye to evaluate the pressure.

#5: Slit-lamp examination

During this test, your eye care professional would use a microscope called a slit lamp to magnify the view of your eye and examine its structures with the aid of light projected by the slit lamp. This will allow them to carefully survey structures at the front of your eye such as the cornea, lens, iris and anterior chamber of your eye. Eye drops containing fluorescein dye may be administered to your eye to enable detection of corneal infections, cuts, scrapes as well as foreign particles. The dye would be washed away by your natural tears within minutes of installation.

#6: Visual field test

This test assesses the sensitivity of your vision at the sides. The most prevalent kind of visual field test is conducted using a HVF machine (Humphreys Visual Field). Your eye care professional would then ask you to look into the HVF machine and fixate at a tiny light in the center while lights of different intensity are randomly projected within the machine to which, you would need to press a handheld clicker.

#7: Corneal Topography

An additional test to examine the surface of your eye would be corneal topography. By mapping the curve of your cornea, this test can reveal problems with the surface of your eye, such as swelling or scarring, as well as astigmatism. Corneal topography is usually conducted prior to a vision correction surgery, such as LASIK or a cornea transplant.

These vision tests above comprise some of the aspects you may encounter during a comprehensive eye examination. Ask your eye care professional any questions about your eye health and share about any symptoms you may be experiencing. Book your next eye appointment in Singapore with planoEyecheck today.

References 2022. 7 Types of Eye Tests That Are Part of a Healthy Eye Exam | CareCredit. [online] Available at: <> [Accessed 1 March 2022].

WebMD. 2022. Eye Tests and Exams. [online] Available at: <> [Accessed 1 March 2022].

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