Monovision is a popular method of correcting presbyopia in Western Europe and the United States. It involves correcting one eye for distance and the other eye for near vision. This method is not among the newest, but only recently it has started to be used more often in Polish optometric offices. This situation prompted me to test one of the popular monovision test procedures, in which it was assumed that the dominant eye is corrected for distance and the non-dominant for near vision. The thesis presents a comparison of two methods of determining the dominant eye: visual and sensory. They represent the basis for the correct measurement of tolerable, monocular near vision additive. In determining the amount of tolerated addition, I followed the procedure developed by Dr. Reinstein. Furthermore the moment of suppression of the eye with the additive was examined. This allowed to present the relationship between the amount of tolerated addition and the amount of addition at which the eye was suppressed. The studies were conducted on two groups of patients: in pre-presbyopic age and in presbyop age. This enabled the comparison of results for two different age groups. The results of the measurement of the tolerated addition and the moment of eye suppression are presented by means of central tendency measures: median, mode and mean. In the theoretical part, in addition to the description of monovision, I have raised issues related to presbyopia and methods of its correction.