What tests are done to check vision?

Generally, vision testing involves several examination items including visual acuity chart testing, refraction testing, fundus examination, color vision testing, and slit-lamp examination. Detailed explanations are as follows:

1. Visual Acuity Chart Testing: This test is divided into distance visual acuity testing and near visual acuity testing. Distance visual acuity testing evaluates the eye's ability to perceive light and recognize details, while near visual acuity testing assesses vision at close range.

2. Refraction Testing: This involves using a computerized refractometer to quickly measure the eye's refractive status, helping to detect conditions such as myopia (nearsightedness), hyperopia (farsightedness), and presbyopia.

3. Fundus Examination: A specialized instrument is used to illuminate and magnify the back of the eye, allowing observation of the retina, blood vessels, and other structures. This examination helps diagnose eye diseases such as glaucoma and macular degeneration.

4. Color Vision Testing: This test typically uses charts displaying various colors and requires the subject to identify specific targets or detect differences between two color shades, thereby evaluating whether color vision function is normal.

5. Slit-Lamp Examination: Using a slit-lamp microscope, this test magnifies and illuminates the cornea, conjunctiva, and anterior chamber, enabling detailed observation of these structures. It is commonly used in diagnosing eye conditions such as dry eye syndrome and keratitis.

In daily life, it is important to use your eyes reasonably and ensure they receive adequate rest. After prolonged eye use, you can relax your eyes through eye exercises or by looking into the distance. Additionally, consuming sufficient vitamin A can help protect your vision.