Final answer:
The type of cataract surgery with the least postoperative astigmatism is LASIK, due to its accuracy and the ability to correct refractive errors such as nearsightedness, farsightedness, and astigmatism.
Step-by-step explanation:
Postoperative astigmatism is least in the type of cataract surgery known as Laser-Assisted in situ Keratomileusis (LASIK).
In LASIK, the cornea of the eye is reshaped by a laser, allowing light to be correctly focused on the retina, and potentially correcting nearsightedness, farsightedness, and astigmatism. This precision and the control over the ablation process in LASIK leads to high accuracy and a decreased likelihood of postoperative astigmatism. With LASIK, normal distant vision can be achieved in more than 90% of patients; however, those with the greatest correction for myopia or hyperopia may have a poorer chance of achieving normal vision due to the fixed percent uncertainty in the corneal reshaping process.