May reappear in up to


of cases, if not properly treated

What is a pterygium?

A pterygium is an abnormal growth of the conjunctiva over the cornea. It most often occurs on the nasal side of the eye, but can occur on the outer side or on both.

What causes it?

The main risk factor for developing a pterygium is exposure to the sun and dryness, which is why it usually occurs in the area between the eyelids. People who work outdoors are most frequently affected.

How can it be prevented?

The main preventive measure is to wear sunglasses during prolonged periods of exposure to the sun and the use of lubricating eye drops to prevent dryness.


A pterygium appears as an elevated whitish zone on the inside and/or outside edge of the cornea. It is painless and symptoms depend mainly on the size of the lesion.

The smaller ones can be asymptomatic, but, as they grow, they can cause discomfort on the surface of the eye, such as: red eye, tearing, foreign body sensation and, in severe cases, vision can become compromised, if it leads to astigmatism, in which larger areas of the cornea become covered.

Associated treatments

The small lesions generally do not require treatment and can be managed simply with lubricating eye drops. More advanced cases require surgical removal.

IMO Institute of Ocular Microsurgery

Josep María Lladó, 3
08035 Barcelona
Phone: (+34) 934 000 700
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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