The push-up method is routinely used to measure the amplitude of accommodation. In this method the diopter value corresponding to the nearest point that the eye can focus is determined, wearing his neutralizing lens, but not the value of the maximum diopter variation that makes the eye.The aim of this paper is to review the calculation described in the push-up method taking into account the real position of the near point of the eye.In the subjective push-up method, it is calculated the reciprocal of the distance from the lens until the test object at this position of first, slight, sustained blur.We calculated the differences between this value and the ocular amplitude of accommodation, taking into account that the eye is really looking at the image of first blur through the neutralizing lens.Experimental measurements were also taken to determine whether they were similar to theoretical values.The results obtained by the two calculation methods compared were in general significantly different and the difference was greater for young people with high

Status of binocular vision is evaluated using binoculars and accommodative tests. The results of these tests allow the optometrist to decide or the type of lenses has to be prescribed or whether a vision therapy is required.The aim of this work is to check the accuracy of the measurement of the relative amplitude of accommodation.Relative accommodation amplitude assesses the ability to increase or decrease the accommodation when convergence demand is constant. The eye must be neutralized to take the measurement. Because the test is situated at a distance of 40 cm, it is considered that the convergence is 2'5 am and the accommodation 2'50 D. However, this assumption could lead to important errors in ammetropic subjects due to the eye after neutralization accommodates in the image produced by the lens forms and converges in the position of the effective binocular object [1]. Therefore, it is necessary to set measurement conditions in which the accommodative and convergence stimulus are the same for all subjects.Furthermore, the lenses added on the neutralization to determine the relative amplitude of accommodation do not correspond to the dioptric value of relaxation and stimulation of the eye accommodation. To obtain this value a more precise calculation has to be performed.

Vicente del Raspeig S/N 03690 San Vicente del Raspeig (Alicante). Spain. ABSTRACTThe measurement of accommodative response is usually performed by means of the Nott method. The accommodative response values were obtained as Optimizing the Nott method would require placing the target at a position where the effective binocular object is 40 cm. Furthermore, the effect of the neutralizing lens should be considered in the calculation method.