Ophthalmic advices:Intraocular lenses (IOL) calculation

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The intraocular lens calculation is an ophthalmologic study from the analysis of the characteristics of the eye to determine the lens must be placed in eye surgery. The calculation of lens is individual and can be different for each eye of each person, according to the characteristics they have. The techniques used are the ultrasound and the optical interferometry.


With ultrasound the action is produced through wave of high frequency sound (ultrasound) emitted by a probe passing through the tissues and return to the probe to measure the size of the eye and evaluate other structures such as the position of the lens and retina are used.

With laser interferometry the action is produced through a laser passing through the eye tissues and to return the computer to measure the size of the eye and evaluate other structures such as the position of the lens and retina.

The final calculation of the lens is performed using mathematical formulas with variables obtained from the measurements of the eye. The results achieved are very accurate, the need for subsequent surgery graduation is minimal. Although anyway in some cases after the operation lenses for better viewing quality may have to be used. You need to apply correction factors and use special formulas when patients have special characteristics of the eyes, for example when they are very nearsighted, farsighted or have previous surgeries.


The decision of the study should be in accordance with the patient and the ophthalmologist, ophthalmic examination assessing jointly with other studies. It is commonly used to determine the lens placed in cataract surgery.


The calculation of intraocular lens is simple and convenient. The patient sits towards the scanner or computer and go take pictures. The study is quick, lasting about 5 minutes. The patient may reinstate your daily life easily.