Fish and amphibians vary the power by changing the distance between a rigid lens and the retina with muscles.
However, the constriction of the pupils is not part of the process called lens accommodation.
Motto: "Whatever." The accommodating style is one of sacrifice, selflessness and low assertiveness.
You are willing to give up just about everything in order to preserve the relationship with the other party.
This process can occur in as little as 224 ± 30 milliseconds in bright light . By the fifth decade of life the accommodative amplitude can decline so that the near point of the eye is more remote than the reading distance. Once presbyopia occurs, those who are emmetropic (do not require optical correction for distance vision) will need an optical aid for near vision; those who are myopic (nearsighted and require an optical correction for distance vision), will find that they see better at near without their distance correction; and those who are hyperopic (farsighted) will find that they may need a correction for both distance and near vision.
Note that these effects are most noticeable when the pupil is large; i.e. The age-related decline in accommodation occurs almost universally to less than 2 dioptres by the time a person reaches 45 to 50 years, by which time most of the population will have noticed a decrease in their ability to focus on close objects and hence require glasses for reading or bifocal lenses.