Optometrists, who help patients with their vision problems, know that certain types of repetitive use of the muscles around the lens of the eye can "train" the lens to become fatter than normal. This often occurs in truck drivers, sailors, and other people who focus on the horizon or at great distances for long periods of time. Based on this figure, which of the following would be the consequence of this, and what shape of contact lens (or lens in eyeglasses) would be prescribed? 
Definitions:
Reliability
The degree to which the result of a measurement, calculation, or specification can be depended on to be accurate.
Causal Relationships
Connections between variables where a change in one variable directly causes a change in another.
Cross-lagged
A statistical technique used in time series analysis to determine the relationship between variables at different points in time.
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