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What Is Convergence? What Are Refractive Errors?
By Dustin Flores | Eye Disorders | Unrated

What is convergence?

Basically there are two types of eye movements. The eyes may move in parallel together, up-down, left-right, or even obliquely, or they may move inwards, simultaneously remaining fixed on an object—convergence.

If you look at your finger and bring it close to your face, you are, in effect, converging your eyes. Simultaneously the eye has to change its focus or accommodate to keep the finger in clear focus. Thus accommodation and convergence are tied together and as long as they work in unison all is well, but if there are imbalances, problems occur which will be discussed in the chapter on squint.

What are refractive errors?

In a normal eye, light is bent or refracted accurately so that it focuses precisely on the retina. An error in focusing, whereby the light is bent either inadequately, or too much, is termed a refractive or a focusing error. There are three basic types of errors: myopia or short sight, hypermetropia or long sight and astigmatism.

Source: http://www.healthguidance.org/authors/727/Dustin-Flores
 
Dustin Flores

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