Complete information for the funding source has been included in Acknowledgments maria pastor-valero, Facultad de Medicina 15 April 2015 Acknowledgments: Inadvertently the complete information about the funding body was not included before. This information has now been added I would like to acknowledge Laura: Ase:nsio (nurse research), who conducted data collection and the ophthalmologists from Sant Joan University Hospital, Alicante, who diagnosed the cataract. This study was supported by the Fondo de Investigaciones Sanitarias, Instituto de Salud Carlos III (Plan Nacional de I+D+I) PS 09/01627 and co-funded by the Fondo Europeo de Desarrollo Regional (FEDER). The EUREYE study was supported by grant QLK6-CT-1999-02094 from the European Commission Vth Framework. Competing interests The author declares that she has not competing interests.