Already in the 20th century, researchers have been studying the correlation between the mass of the lens and the age of the body. In reference to this the mass of the lens was used as a basis for analyzing the effect of the bone marrow transplantation on growth and ageing, and thus to the weight of the ocular lenses of mice. The purpose of the research was therefore, to first validate the applied methodology, which led to credible results. The obtained results were then processed by comparative statistical analysis in the SPSS programme. The purpose of the research was therefore, to first validate the applied methodology, which led to credible results. The obtained results were then processed by comparative statistical analysis in the SPSS programme. We have confirmed that the fixation time of ocular lenses in formalin does not play a significant role (or: can be neglected). Furthermore, in the event of the standardized drying, the effect of moisture on the dry weight of the ocular lenses can be nullified. This ensured our methods as appropriate for the essential part of the research. We have found that with the age of the organism, the mass of lenses increases and also that the increase rate decelerates with the age of mice. We also confirmed that the mass of mice is in partial correlation with the weight of the lens, which means that there is also a link between the age and the weight of mice. In addition, comparing the masses of ocular lenses of control and experimental groups of mice with transplanted bone marrow showed that there are no statistically significant differences in the weight of the lenses. From the results it is to conclude that the mass of the lenses is a useful indicator for determining the age of laboratory mice. Based on the given model of bone marrow transplantation, the thesis that the bone marrow transplantation might have an impact on the weight of the eye lenses in mice is refuted.
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