Skip to main content

The classification of types of visual errors is based on the condition of your eyes. You need to go to the optometrist to know if you have a visual error and the type. Sometimes you might have more than one type of visual error. Some need corrective lenses, medication or surgery, and some do not.

When a doctor tests your vision these are the possible diagnoses:

Emmetropia

This is a fancy way to say that a person has 20/20 almost perfect vision. Meaning that the person has NO visual errors. These people have no refractive errors or de-focus because the light rays fall on their retina the way they ought to. No glasses or intervention for them. But they must try to keep it that way by maintaining healthy practices that are good for the eyes and general wellbeing.

Nearsightedness/Myopia

This means the person can see things nearby clearly, but things at a distance look blurry. The farther away, the harder it is to see. People are said to be nearsighted when the eye is too long or the cornea is too steep, so light rays focus in front of the retina. These people need glasses, contact lenses or surgery.

Farsightedness/Hyperopia

This means the person can see things clearly when they are far away, but they become blurry when they are close. The light rays are falling behind the retina. These people need glasses, contact lenses, and sometimes, surgery.

Astigmatism

This vision type means that some of the light rays are scattered, so they are not all landing on the retina alone. Some land on the retina, while some are landing in front of it and others are behind the retina. The more scattered these light rays, the more severe the astigmatism. This vision type is caused by the eye shape being more oblong than round (think American football shape). Their vision becomes distorted, so they might see shadows, double images or ghosting. This means that they experience blurred vision at distance and at near if vision is sustained for a period of time.

This condition often exists alongside either farsightedness or nearsightedness. These people need glasses, contact lenses, and in some cases, surgery.

Vision of a person with astigmatism

Presbyopia

This name might make you think of the word Presbyterian. Presby- is a prefix that simply means ‘old’. This visual error develops as one gets older. By the time people enter their 40s to 50s, and for some persons late 30s, they begin to have difficulty with reading at near. The lens of the eyes have become harder with age so focusing on the reading material becomes more difficult. These people need reading glasses, contacts, and in a few cases, surgery.

A lady with presbyopia

When you come in for an eye test, these are the eye conditions you might have. Keep calm if you do not have emmetropia and let your doctor tell you what you can do to correct the condition. Contact us today for your eye test and for help with any eye condition you might be facing.