Do not wear contact lenses for

48 h


What is it?

Ocular biometry is a test that measures the dimensions of the eyeball: the axial length (distance between the anterior and posterior parts of the eye) and the depth of the anterior chamber (part between the cornea and the iris and lens). It is also used to measure the thickness, the curvature and the diameter of the cornea.

This test determines the precise dimensions of the eye where an intraocular lens is to be implanted.

The test must be performed extremely precisely, as it will be used to determine the exact measurement of the intraocular lens to be implanted in the eye

How is it performed?

Ocular biometrics are performed according to two techniques:

  • Ultrasound biometry (ultrasound emitted into the cornea, requiring contact with the cornea and anaesthesia. It is invasive for patients and takes longer to perform by specialists)
  • IOL MASTER optical biometry (uses infra-red laser light, is not invasive for patients who feel noting and no anaesthetic or dilating eye drops are required).

Optical biometry is the most commonly used at present, as it provides a more precise calculation except in very specific cases (very opaque lenses).

4 keys to biometry

  1. It is a painless test.
  2. Pupil dilation is not necessary.
  3. You must not wear contact lenses for 48 h beforehand.
  4. Test duration: 15 minutes.

What diseases can be diagnosed?

This test is necessary for:

The power of the lens to be implanted is calculated based on its results.

Associated treatments

IMO Institute of Ocular Microsurgery

Josep María Lladó, 3
08035 Barcelona
Phone: (+34) 934 000 700
E-mail: international@imo.es
See map on Google Maps

By car

GPS navigator coordinates:
41º 24’ 38” N – 02º 07’ 29” E

Exit 7 of the Ronda de Dalt (mountain side). The clinic has a car park with more than 200 parking spaces.

By bus

Autobus H2: Rotonda de Bellesguard, parada 1540

Autobus 196: Josep Maria Lladó-Bellesguard, parada 3191

Autobuses H2, 123, 196: Ronda de Dalt – Bellesguard, parada 0071

IMO Madrid

C/ Valle de Pinares Llanos, 3
28035 Madrid
Phone: (+34) 910 783 783
See map in Google Maps

Public transport

Metro Lacoma (líne 7)

  • Lines 49 & 64, stop “Senda del Infante”
  • Line N21, stop “Metro Lacoma”


Patient care:
Monday to Friday, 8 a.m. to 8 p.m.

IMO Andorra

Av. de les Nacions Unides, 17
AD700 Escaldes-Engordany, Andorra
Phone: (+376) 688 55 44
See map in Google Maps

IMO Manresa

C/ Carrasco i Formiguera, 33 (Baixos)
08242 – Manresa
Tel: (+34) 938 749 160
See map in Google Maps

Public transport

FGC. Line R5 & R50 direction Manresa. Station/Stop: Baixador de Manresa


Monday to Friday, 08:30 A.M – 13:30 PM / 15:00 PM – 20:00 PM

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