Vision and eyeglass changes during pregnancy

By trimester

Weeks 1–13

1st trimester

Noticeable prescription changes are uncommon this early, since the corneal and lens changes behind the shift tend to build later in pregnancy. If your vision already feels different now, it is still worth mentioning at a visit rather than assuming it is this phenomenon.

Weeks 14–27

2nd trimester

This is typically when the shift becomes more noticeable, alongside the same corneal fluid-retention changes that can cause general blurry vision or dry eyes. It's also the point when your provider starts watching more closely for preeclampsia, so any new vision symptom is worth mentioning rather than dismissing.

Weeks 28–birth

3rd trimester

The shift tends to be most pronounced now, though research suggests it stays small for most people. This is also the trimester when providers watch most closely for preeclampsia-related vision changes, so pay attention to whether a new symptom comes with a headache, swelling, or high blood pressure.

What does the evidence show for eyeglass prescription changes?

• In a study of 100 pregnant women, distance visual acuity progressively worsened from the second to third trimester and improved postpartum. A myopic shift appeared in 36% of women in the second trimester and 40% in the third, with simple myopia the most common refractive error found. 1
• The same study found these changes resolved by six weeks postpartum and did not warrant medical intervention during pregnancy, so the researchers recommended counseling patients about the temporary shift rather than issuing a new spectacle prescription while still pregnant. 1
• In a separate study following 25 healthy pregnant women across all three trimesters, best-corrected visual acuity significantly decreased in both eyes alongside a myopic shift, while near-point accommodation and convergence did not change significantly. 2
• That study's authors advised postponing changes in eyeglass prescription, contact lens fitting, and refractive surgery until several weeks after delivery, because refractive status is still unstable during pregnancy itself. 2
• Refractive errors, including nearsightedness, happen when the shape of the cornea or the length of the eyeball changes how light rays bend and focus, producing blurry vision that glasses or contact lenses correct by adjusting how light reaches the retina. 3
• Blurred vision is listed as a possible symptom of preeclampsia, and vision problems, including temporary blindness, are listed as a symptom of eclampsia, the more severe, seizure-related form of the condition, so new vision changes are not automatically the ordinary pregnancy-related shift. 4

Ordinary shift or warning sign?

When should I call my provider about eyeglass prescription changes?

Ordinary pregnancy-related prescription drift is gradual and mild, and on its own is not an emergency. Sudden or severe blurred vision, temporary vision loss, double vision, or a sensation of a curtain or shade over part of your vision needs urgent eye evaluation rather than a routine glasses appointment. Blurred vision is also listed as a possible symptom of preeclampsia, and vision problems including temporary blindness are listed for eclampsia, so new vision changes alongside a headache that won't go away, swelling, or high blood pressure need a same-day call to your provider. If you are ever unsure which side of the line you are on, make the call. Obstetric teams handle these check-ins as routine, not as overreacting.