The process by which the lens changes shape to focus incoming light so that it falls on the retina is called:

visual accommodation.

Explanation:

As rays of light (near) comes into the eyes, the lens changes it shape in other to focus these rays on the retina. Accommodation involves constriction of the pupils, convergence and changing the refractory power of the lens.

Objects more than 6 metres away from the eyes are focused on the retina without adjustment of the lens or convergence of the eyes

cause you are attracted to the features of girls or if you are a boy you are attracted to the features of a boy.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.