An eye condition is corrected using a +6.0 D+6.0\text{ D}+6.0 D lens.
Which eye condition could be corrected by using this lens?
Calculate the magnification produced by the +6.0 D+6.0\text{ D}+6.0 D lens when viewing an object 20 cm20\text{ cm}20 cm from this lens.
The diagram shows a cross-section of a human eye.

State the name and primary function of structures X, Y, and Z.