Ocular biometry involves precise anatomical measurements of the eye, including the axial length of the eyeball, the thickness of the lens and cornea, and the depth of the anterior chamber.
Biometry is performed, for example, before a cataract surgery, and before a refractive lens exchange to calculate the power of the intraocular lens.
Biometry can also be used to take measurements of pathological changes in the eye, such as tumors or cysts.
Biometry can be performed using either a contact method (with an ultrasound transducer) or a non-contact optical method, which is more accurate.
The test usually lasts several minutes.
It can be performed on patients of any age, including pregnant women and young children.
Important! Makeup must be washed off and contact lenses removed before the test.
Contact biometry is usually performed in the supine position, with a special ultrasound transducer.
The examined eye is anesthetized, a plastic cup filled with water is put on to keep the eye open, and the ultrasound probe penetrates the anterior segment of the eye. The examiner can see the structures on the computer screen and measure them.
Non-contact biometry does not require direct contact with the surface of the eye. It is based on optical coherence tomography (OCT).