The physiological changes after pregnancy are comprehensive, including changes in metabolism, hormones and blood vessels. There are also some temporary ocular changes, some transient and some severe. Pregnancy can cause mild refractive error: The curvature of the cornea becomes steeper during pregnancy, resulting in a change of 0.25 to 1.25 diopters during the examination, resulting in mild refractive error. This is due to the increase in luteinizing hormone after pregnancy, which causes an increase in water in the cornea and crystalline body, resulting in mild corneal edema, which is more pronounced at the end of pregnancy. As a result, farsightedness and ciliary muscle regulation are reduced, and blurring of near objects is one of the situations. If the eye is already myopic, the myopia will increase. This abnormality also returns to normal 5 to 6 weeks after delivery. Therefore, if a mother-to-be is farsighted or myopia deepens, she does not have to rush to change her glasses, she can have them tested more than a month after delivery, so that the test is relatively accurate. Some people who wear contact lenses to look at things will find that their vision is sometimes good and bad, not very stable, is also caused by this reason. In this case, you can stop wearing contact lenses temporarily and wait for some time after delivery. In addition to unstable vision, there are some other eye changes: In a normal pregnancy, besides the phenomenon of mild refractive error, the intraocular pressure is also lower in the second half of pregnancy because of the lowering of venous blood pressure in the head. Two months after delivery, the IOP will return to its original level. Some pregnant women may have mild drooping eyelids, which can be improved after delivery. Some pregnant women may have an increase in eyelid pigmentation. Pregnant women with toxemia may be at risk for blindness: The term “toxemia” refers to abnormalities that occur at the end of pregnancy, including high blood pressure, proteinuria, edema of the limbs, and even seizures or coma. This is caused by vasoconstriction of the small arteries throughout the body, which can also affect the arteries of the retina, choroid, and optic nerve, causing ischemia, edema, hemorrhage, and even retinal detachment, resulting in vision loss. Fortunately, these ocular changes usually subside on their own after delivery. Very few cases have been reported in which pregnant women have lost their vision due to severe ischemia in the occipital lobe of the brain, resulting in brain cell necrosis and so-called “cortical blindness. Pregnancy can aggravate or worsen pre-existing eye diseases: Some eye diseases can be aggravated by pregnancy. For example, diabetic retinopathy. In particular, proliferative diabetic retinopathy must be treated, otherwise it may lead to blindness. 1.People who have diabetes must control it before pregnancy. If necessary, laser treatment of retinopathy should be performed to avoid deterioration of the eye disease after pregnancy. If treatment is needed during pregnancy, laser treatment is also available and should not be delayed. 2.Some eye hemangiomas may show symptoms for the first time only after pregnancy. This is because the increased blood volume and cardiac output of pregnant women may cause the emergence of hemangiomas in the retina or eye sockets. Tumors in the pituitary gland can grow larger as a result of pregnancy, which can compress the optic nerve and cause visual field loss. Another type of “brain pseudotumor” can cause an increase in brain pressure, resulting in edema of the optic nerve papillae, which can affect vision. This condition may also be aggravated by pregnancy and should be treated with “optic nerve decompression” if necessary. Pregnant women must have regular eye examinations! Pre-pregnancy health check-ups should include an eye examination. If there is any change in vision after pregnancy, it is important to consult an ophthalmologist as soon as possible. Since pregnancy can affect every organ of the body, the eyes can reflect these changes. Therefore, it is very important for pregnant women to see an ophthalmologist every two to three months for eye examinations in addition to regular visits to the obstetrician and gynecologist.