Myopia causes blurred vision when looking at distant objects;
Presbyopia makes it difficult to see nearby objects clearly;
Therefore, many believe presbyopia and myopia can cancel each other out—meaning those with myopia in youth won't develop presbyopia later. Is this true?
Today, a trending topic on People's Daily Online's official Weibo reveals whether this is fact or fiction.
Regardless of whether you have normal vision, myopia, or presbyopia, presbyopia will develop with age. While myopia may change in severity after presbyopia sets in, the two conditions do not cancel each other out.
Yes, everyone, wake up! Don't get your hopes up—what's bound to happen will happen!
So what exactly are myopia and presbyopia?
Myopia is mostly caused by genetic factors or long-term poor eye habits, leading to weakened refractive power in the cornea and lens. This causes parallel light rays to focus in front of the retina, making distant objects appear blurry.
Presbyopia, however, arises from age-related changes: the lens gradually hardens and loses elasticity, while the ciliary muscle's contraction function diminishes. This compromises the eye's ability to adjust focus, making near objects appear blurry.
Myopia and presbyopia are distinct concepts with fundamental pathological differences. Myopia stems from refractive errors, while presbyopia results from lens degeneration and loss of elasticity.
But are myopia and presbyopia truly unrelated? Not entirely!
Myopia can partially offset presbyopia:
While myopia and presbyopia stem from different causes—myopia being refractive errors causing blurred distance vision, and presbyopia being age-related physiological visual decline causing blurred near vision—they share a common mechanism.
When presbyopic individuals obtain reading glasses, their myopia offsets some of the required hyperopia correction. Consequently, for those with myopia, the onset of presbyopia may allow them to see nearby objects clearly without reading glasses or with lower-strength lenses! However, distance vision still requires wearing myopia glasses.
Do you have presbyopia? Take this test: if you experience more than half of these symptoms, you may have presbyopia:
1. Blurred vision when looking at close objects
2. Easily fatigued when focusing on close objects, unable to sustain it
3. Momentary blurred vision when switching between near and distant objects
4.Removing your nearsighted glasses improves near vision
5. Requiring brighter lighting for reading
6. Experiencing eye strain, dryness, redness, swelling, pain, light sensitivity, or tearing during close reading or work
What if you have both nearsightedness and presbyopia?
Individuals with pre-existing myopia who develop presbyopia in later years face the challenge of "unclear vision at both near and far distances." This necessitates either preparing two pairs of glasses with different prescriptions or opting for progressive multifocal lenses, depending on personal circumstances.
For retirees who spend most of their time at home with minimal close-up tasks—such as using smartphones, tablets, or reading newspapers—traditional single-vision reading glasses are ideal. They offer high comfort, a short adjustment period, and excellent value for money.
For those whose occupations require frequent switching between near and far vision, progressive multifocal lenses are preferable. They eliminate the hassle of switching glasses, providing clear vision at all distances—near, intermediate, and far—with a single pair.
Finally, if you have presbyopia, it's crucial to get properly fitted reading glasses and schedule regular check-ups. As your prescription strengthens, your existing glasses become inadequate. If objects suddenly appear blurry or...