What is a refractive error?

Refractive errors are a group of visual problems that create difficulties in achieving clear sight. They are collectively known as ametropia, and they represent the most prevalent category of vision issues experienced by individuals. These errors arise when light fails to accurately focus on the retina, the light-sensitive layer situated at the back of the eye.

Refractive errors can be caused by:

  • Eyeball length

    characterised by an excessively long or short eyeball, which can be assessed using a biometer

  • Age

    alterations in the crystalline lens, an inner component of the eye which is normally clear and is pivotal in facilitating focus

  • Irregularities

    in the corneal shape (the transparent outer layer of the eye). If the cornea is excessively steep or insufficiently curved, it can lead to blurred vision, and this can be measured using specialised equipment like a topographer