Smoking can easily damage eyesight.

Smoking is directly linked to two leading causes of blindness: cataracts and macular degeneration. Numerous studies have shown that smoking is a cause or contributing factor to several other eye diseases as well.

Smoking can lead to many chronic diseases. (Illustrative image)

Some common diseases caused by the effects of tobacco include cataracts, macular degeneration, dry eyes, optic nerve ischemia, conjunctivitis, chronic blepharitis, worsening of diabetic retinopathy, and pre-existing uveitis.

Accordingly, smoking reduces the oxygen concentration in the lens, which then leads to cataracts. The highly toxic heavy metal cadmium also accumulates in the components of the eye's nucleus. Clinically, the risk of developing cataracts is twice as high in smokers as in non-smokers and three times as high in heavy smokers.

With macular degeneration, smokers have a 2-4 times higher risk of developing it compared to non-smokers. The toxic elements in tobacco damage the blood-retinal barrier, reducing blood flow to the retinal tissue and contributing to wet macular degeneration. This is one of the two leading causes of blindness in people over 60, second only to cataracts.

Furthermore, cigarette smoke, with its dry, hot nature and high irritant content, can cause chronic conjunctivitis and blepharitis. The increased evaporation of tears due to the hot smoke leads to evaporative dry eye.

All patients with uveitis and Graves' disease exhibiting ocular manifestations experience worsening of symptoms, increased recurrence frequency, and a higher risk of chronic disease if they continue smoking due to reduced blood supply to nerve tissues. Smoking also exacerbates pre-existing diabetic retinopathy, causing optic nerve ischemia.

For patients with diabetes, uveitis, Graves' disease, etc., if they cannot quit smoking, their treatment will be in vain.

Pregnant women who smoke increase their risk of their unborn children developing bacterial meningitis by five times compared to others, which can lead to blindness.

Quitting smoking helps reduce your risk of developing eye diseases or keeps existing conditions stable, preventing worsening or complications. For those who quit smoking, the rate of macular degeneration drops to nearly 7% after one year, and to 5% after five years. Similarly, quitting smoking for 25 years reduces the risk of cataracts by 20% compared to those who continue to smoke.