When looking at the phone, Ms. Zhang (pseudonym), 41, unconsciously holds it farther away to read clearly. To see work documents, she must remove her longtime nearsighted glasses. At the beginning of this year, she noticed these strange changes, along with increased eye fatigue and soreness. "Could something be seriously wrong?" Thinking of terms like retinal病变 and glaucoma mentioned by colleagues, she quickly made an appointment with an ophthalmologist.
Lifestyle changes are the main cause.
Dr. Zhao Feng, Chief Ophthalmologist at Nanjing First Hospital, examined Ms. Zhang including visual acuity and refraction tests. He told her she was experiencing presbyopia — the so-called "old eyes." Ms. Zhang was puzzled: at only 41 and nearsighted, how could her eyes be "aging" so early?
Presbyopia is considered the "midlife crisis" of the eyes. It is the declining ability of the eye to change focus, failing to meet daily autofocus needs. Before 40, the eye works like a powerful zoom camera, focusing efficiently and accurately at different distances. After 40, the zoom range narrows, focus slows, until clear images are only possible within a small range.
Why does presbyopia occur? The main reason is reduced elasticity of the crystalline lens, secondarily weakened ciliary muscle function. The lens is a convex structure inside the eye; its shape and position change under ciliary muscle drive, allowing light to focus clearly on the retina. When lens elasticity drops or ciliary muscle weakens, the lens cannot zoom effectively, causing defocus — what we perceive as "blurred vision."
Strictly physiologically, the age of presbyopia onset hasn't significantly advanced; it still follows natural laws starting around 40. But why do we generally feel it's happening earlier and more commonly?
Experts say this is mainly due to lifestyle changes. Overuse of electronic devices is the primary reason for perceived earlier presbyopia. Long hours of intense close-up screen time keep the ciliary muscle in chronic high tension and spasm. Lack of outdoor activities means eye "muscles" get no rest or exercise, accelerating functional decline. Additionally, past tolerance for blurry vision was higher, but today's information age demands sharper, more comfortable reading — any inconvenience is immediately noticed and addressed.
How does presbyopia affect us? For mild to moderate myopes, removing glasses for near work is comfortable, giving rise to the myth "nearsighted people never get presbyopia." In fact, removing minus lenses (myopia correction) effectively adds plus power (like reading glasses), which is a classic sign of presbyopia. For emmetropes, distance vision is fine without glasses, but near vision becomes increasingly dependent on glasses with age, causing minor daily nuisances. For hyperopes, both distance and near are blurry, making glasses essential, often with marked visual fatigue. Presbyopia can also affect psychology, making some feel "old," leading to frustration and stress.
Prevention is key — act early.
There is no strict cure for presbyopia; optical correction to solve focusing issues is the only mature solution. Traditional spectacles include: single-vision reading glasses (for near only, must remove for distance); bifocal/trifocal lenses (multiple zones but with image jump and cosmetic concerns); progressive multifocal lenses (mainstream choice: upper for distance, lower for near, smooth intermediate zone, seamless visual transition but requires adaptation).
Surgical options include corneal laser surgery, lens replacement surgery, etc. There is no absolute "best age" — requires professional evaluation combining ocular conditions and patient needs.
For those under 40 with "early-onset presbyopia," scientific eye training can enhance ciliary muscle strength and flexibility, improving binocular coordination. Suggested protocols: under 40 — preferred accommodation training, plus anti-fatigue lenses; 40-60 — progressive multifocal lenses preferred, careful consideration for presbyopia surgery; over 60 — if combined with cataract, multifocal IOL preferred, or monocular undercorrection as alternative.
Expert tips to delay "aging eyes" :
1. Control screen time and viewing distance: Follow the "20-20-20" rule — every 20 minutes of near work, look at something 20 feet (6 meters) away for at least 20 seconds. Maintain reading distance of at least 40 cm.
2. Increase outdoor activity: Ensure 1-2 hours outdoors daily. Natural light and distance viewing are the most effective ways to relax the ciliary muscle.
3. Ensure adequate lighting: Read in well-lit, uniform environments. Avoid using phones in the dark.
4. Balanced diet: Eat foods rich in vitamins A, C, E and lutein — dark leafy greens, yellow fruits, eggs.
5. Quit smoking and limit alcohol: Studies show smoking accelerates lens aging.
6. Regular eye exams: Starting at 40, have a comprehensive eye exam every year to monitor presbyopia progression and detect glaucoma, macular degeneration, etc.
