SciELO - Scientific Electronic Library Online

vol.17 issue49Knowledge of people living with HIV/Aids about Antiretroviral TherapyAnxiety among caregivers of patients with Chronic Obstructive Pulmonary Disease after hospital discharge author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Enfermería Global

On-line version ISSN 1695-6141


DELGADO ESPINOSA, Carlos; CASTANEDA SUARDIAZ, Josefina G.; CORDERO JORGE, Noelia  and  RODRIGUEZ RODRIGUEZ, Sarai. Investigation of the Efficiency of the TNO Test for the Early Detection of Amblyopia in Primary Care. Enferm. glob. [online]. 2018, vol.17, n.49, pp.142-163.  Epub Dec 14, 2020. ISSN 1695-6141.

Ambliopia is the most common preventable cause of the loss of vision in developed countries, affecting the 2-5% of the population. This may evolve due to an abnormal visual experience, during the phase of visual development. Strabismus is the principal cause of the development of ambliopia, being 30 - 50% of the cases. The early detection of visual alterations causing ambliopia is considered to be of primary importance as the treatment is only effective during infancy, when the visual system becomes mature.

The Health Council of the Canary Island Government a few years ago developed a program for the detection of visual alterations in childhood, and has recently incorporated the introduction of the TNO test to the habitual examinations. This investigation precisely intends to value the efficiency of the TNO Test in the early detection of ambliopia and the comparison with other habitual tests that are carried out in Primary Care.

During the study, an exhaustive revision and comparative analysis is made of the vision tests of 358 medical records in a health centre in the province of Santa Cruz de Tenerife, corresponding to children between 3 and 6 years old.

According to the results obtained, we can surmise that the TNO test is a valid test for the detection of anomalies, which can be used in the early detection of ambliopia, in comparison to the most popular tests used habitually in a health care centre for the detection of strabismus and ambliopia.

Keywords : Amblyopia; strabismus; binocular vision; Test TNO; children; visual acuity.

        · abstract in Spanish     · text in English | Spanish     · English ( pdf ) | Spanish ( pdf )