Normal Values of Amplitude of Accommodation through an Objective Technique in Pre-Presbyopic Emmetropic People between the Ages of 35 and 40 from the Optometry Clinic at La Salle University

Abstract

<em><strong>Objective:</strong></em> To determine the reference values of amplitude of accommodation through the dynamic objective measurement of the amplitude of accommodation (MODAA, for its initials in Spanish) in pre-presbyopic emmetropic people between the ages of 35 and 40, examined at the Optometry Clinic from La Salle University. <em><strong>Methodology:</strong></em> Fifty emmetropic patients were included, distance and near visual acuity with each eye equal or better than 20/30, normal binocularity. Defects of more than 1.50 Dpt in its sphere or more than 1.00 Dpt in the cylinder were excluded, as well as accommodative and vergence alterations, strabismus, amblyopia, anisometropia (≥ 1.00 Dpt in the sphere or the cylinder), systemic diseases, anterior or posterior segment alterations, ocular history of surgery or trauma. Each patient was subjected to three tests of amplitude of accommodation: MODAA, Donders and Sheard, and the values were compared according to Hofstetter and Duane. <em><strong>Results:</strong></em> The reference value found for MODAA in patients between the ages of 35 and 40 was: 4 Dpt (SD 0.25 Dpt). The subjective techniques (Donders and Sheard) gave higher values than MODAA. The reference values of Hofstetter, Donders and Duane have statistical differences from MODAA. Conclusions: The MODAA method has a range of reference in pre-presbyotic patients between 3.75 and 4.25 Dpt, and this value is not comparable to Donders and Duane’s normality value tables nor with the Hofstetter formulas.