Device to improve visual acuity in low vision that includes: - a target tube (1) which at one of its ends has a groove (2) of suitable dimensions so that a positive spherical lens is inserted in said groove; - an eye tube (5) which at one end has a groove (3) of adequate dimensions so that a negative spherical lens is inserted in said groove, at the other end it has inscribed and tabulated information for the determination of the increase or amount of times the image is enlarged according to the visual acuity of each patient with low vision, and whose diameter is smaller than the diameter of the objective tube (1) so that the slot of the ocular tube (5) approaches or moves away from the slot of the objective tube (1) by sliding the eye tube (5) inside the objective tube (1). device for improving visual acuity in low vision, according to claim 1, whose objective tube measures between 25 and 30 cm and has a diameter between 3 and 3.5 cm. 3. Device for improving visual acuity in low vision, according to claim 1, whose eye tube measures between 25 and 30 cm and has a diameter between 2.5 and 3 cm. (Machine-translation by Google Translate, not legally binding)