The widespread use of digital devices like smartphones, computers, and televisions has become an essential part of daily life across all age groups. Communication, education, work, and recreation demand their compulsory use.
Prolonged screen exposure is linked to a cluster of visual symptoms known as Digital Eye Strain (DES). Let us understand the issues one by one.
Light emitted from smartphones
Symptoms
Management
References:
Kusumesh R, Ambasta A, Venugopal A, Kumari R, Singh P.
Article ‘Visual impact of smartphones: A view of ocular changes and management approaches’ published in Indian J Ophthalmol 2025;73:1723-8.
Prolonged screen exposure is linked to a cluster of visual symptoms known as Digital Eye Strain (DES). Let us understand the issues one by one.
Light emitted from smartphones
- Causes constriction of pupil → miosis → leading to convergence → difficulty in reading.
- Blue spectrum of smartphones decreases melatonin production, a hormone controlling sleep-wake cycles → sleep disturbances → insomnia + mental fatigue → dry eyes + tactile hallucinations.
- Refractive change → myopia due to exposure to light from smartphones and reduced outdoor activity time.
- IOP – Smartphone use demands ocular adjustments for near vision → increased demand for accommodation and vergence → increased IOP. IOP rise is faster in eyes with anterior chamber depth less than 2.32 mm and in persons above 48 years of age.
- Effects on ocular surface:
- Tear blink rate is 21 per minute. It reduces to 3 to 7 per minute with increased incomplete blinks.
- Tear film breakup time is reduced to less than 5 seconds.
- Tear film evaporation increases.
Symptoms
- Ocular surface disturbances: Dry eyes – irritation – burning – eye fatigue – sensitivity to bright light and headache.
- Accommodative stress: Blurred near vision – eyestrain – transient distant blur – difficulty in shifting focus between distances – double vision – neck and shoulder pain.
- Ergonomic interventions:
- 20-20-20 Rule – Take a 20-second break to look at an object 20 feet away after every 20 minutes of screen use.
- Maintain screen distance at 30–40 cm and keep the device slightly below eye level to reduce ocular surface exposure and promote normal blinking.
- Reduce screen time to less than 4 hours a day.
- Reduce brightness at night and change to ‘Night Shift’ mode.
- Use software-controlled blue light reduction and spectacles with yellow chromophore coating on anterior and posterior surfaces of the lenses.
- Tear film integrity:
- Use preservative-free lubricating eye drops.
- Apply warm compresses on eyelids.
- Nutritional supplements: Antioxidants, omega-3 fatty acids, vitamins C & E, zinc, copper, beta-carotene; plant extracts: blueberry, curcumin.
- Conduct a thorough eye check-up for refractive error, binocular vision, IOP, and any discharge. Provide needful treatment.
- Check duration of device use and type of device used.
- Consider environmental factors like lighting, humidity, and posture during use.
Smartphones are here to stay—protect your eyes with smart habits today!
References:
Kusumesh R, Ambasta A, Venugopal A, Kumari R, Singh P.
Article ‘Visual impact of smartphones: A view of ocular changes and management approaches’ published in Indian J Ophthalmol 2025;73:1723-8.