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This is made possible by the IOL’s unique design structure, which allows the lens to move back and forth as it would during natural focusing of the eye.

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In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers.

Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first.

For those researchers working in the field of human history, the chronology of events remains a major element of reflection.

Archaeologists have access to various techniques for dating archaeological sites or the objects found on those sites.

There are two main categories of dating methods in archaeology: indirect or relative dating and absolute dating.

Relative dating includes methods that rely on the analysis of comparative data or the context (eg, geological, regional, cultural) in which the object one wishes to date is found.