From the moment they learn of their pregnancy, mothers-to-be are in a state of bliss, constantly watching the slightest changes in their fetus. However, mothers-to-be should not forget that they should also pay attention to their eyes at this time. Throughout pregnancy, the body systems, such as the endocrine, circulatory, respiratory, digestive and immune systems, change significantly in order to ensure the healthy development of the fetus. These changes can also have a variety of effects on the eye, an important organ, and can even lead to eye diseases. What eye diseases are likely to occur during pregnancy? Under normal circumstances, the surface of the eye is covered with a tear film, which moisturizes and protects the eye. During pregnancy, due to changes in hormone levels in the body, tear secretion decreases, which can easily cause dry eye syndrome. Second, corneal edema During pregnancy, due to the increased secretion of progesterone and electrolyte imbalance, the water content in the cornea increases, resulting in mild corneal edema. The more advanced the pregnancy, the more obvious the edema. Corneal edema can return to normal in 6 to 8 weeks after delivery. Therefore, it is recommended that pregnant women try not to wear corneal contact lenses and use frame glasses instead. Third, refractive error As the corneal edema of pregnant women, the corneal curvature will also change, more obvious in the late pregnancy. During the refractive examination during pregnancy, there will be a change of 0.25 to 1.25 diopters. This phenomenon mostly returns to normal 6 to 8 weeks after delivery. If a pregnant woman has a change in the prescription of her glasses, she can have her glasses examined and fitted again two months after delivery. Pregnancy hypertension syndrome is a dangerous condition that endangers the lives of pregnant women and fetuses. Pregnant women develop hypertension, edema and proteinuria. The eyes may show eyelid and conjunctival edema, tortuous small vessels in the bulbar conjunctiva, spasm and narrowing of small retinal arteries, retinal edema, hemorrhage and exudation, and even retinal detachment. When the retina has hemorrhage, edema, exudation and detachment, it means that the heart, brain and kidney are damaged. Diabetic eye disease There are two types of diabetes in pregnancy: one is diabetes diagnosed before pregnancy; the other is diabetes with normal glucose metabolism or potentially impaired glucose tolerance before pregnancy, which only appears or is diagnosed during pregnancy. Diabetes can cause eye pathologies such as retinopathy, cataract, neovascular glaucoma, dry eye, refractive error and neuropathy. If you have had sclerositis, uveitis, peripapillary retinitis, optic neuritis and other eye diseases before pregnancy, pregnancy may lead to the recurrence of these eye diseases. In order to prevent the occurrence of eye diseases during pregnancy, pregnant women should pay attention to the changes in vision of both eyes. If there is obvious visual fatigue, blurred vision, black shadows floating in front of the eyes, or the recurrence or sudden aggravation of the original eye disease, they should go to the hospital ophthalmology department in time to avoid delaying the best time for treatment.