열사병 경험자, 백내장 위험 2배”…日 연구팀 “폭염·고령화로 환자 증가 우려” [KDF World] – 한국면세뉴스

Japanese researchers have identified a significant correlation between a history of heatstroke and an increased risk of developing cataracts. The findings indicate that individuals who have previously suffered from heatstroke are twice as likely to develop cataracts compared to those who have not experienced the condition.

This discovery highlights a previously underemphasized link between acute heat-related illnesses and long-term ocular health, suggesting that the systemic impact of extreme hyperthermia extends beyond immediate organ failure to include degenerative changes in the eye.

The Physiological Link Between Heatstroke and Cataracts

The research suggests that the severe physiological stress associated with heatstroke may contribute to the clouding of the eye’s lens. Heatstroke is characterized by a critical rise in core body temperature, which can trigger systemic inflammation and oxidative stress throughout the body.

These processes are believed to potentially damage the proteins within the lens of the eye. Because the lens relies on highly organized proteins to remain transparent, the denaturation or aggregation of these proteins—often accelerated by extreme heat and oxidative damage—can lead to the opacification known as a cataract.

While cataracts are commonly associated with aging and long-term ultraviolet exposure, this research indicates that a single severe episode of heatstroke may act as a catalyst, accelerating the onset of the condition.

Public Health Concerns in Aging Populations

The Japanese research team expressed concern that the prevalence of cataracts could rise significantly due to two converging global trends: the increasing frequency and intensity of heatwaves and the growth of aging populations.

Older adults are generally more susceptible to heat-related illnesses due to a decreased ability to regulate body temperature and a higher likelihood of taking medications that interfere with thermoregulation. Simultaneously, this demographic is already at a higher baseline risk for age-related cataracts.

The combination of these factors creates a heightened vulnerability. As extreme heat events become more common, the risk of heatstroke increases, which in turn may increase the long-term burden of preventable vision loss among the elderly.

Preventative Strategies and Long-term Health

The findings underscore the importance of heatstroke prevention not only as a means of immediate survival but as a strategy for preserving long-term sensory health. Reducing the incidence of acute heatstroke may serve as a preventative measure against subsequent ocular degeneration.

Public health guidance typically emphasizes several key protocols to mitigate the risk of heat-related illness, which may indirectly protect eye health:

• Maintaining consistent and adequate hydration during periods of high temperature.
• Limiting outdoor activities and avoiding direct sunlight during peak heat hours.
• Utilizing air conditioning or cooling centers to maintain a stable core body temperature.
• Wearing lightweight, breathable clothing to facilitate heat dissipation.

By implementing these measures, particularly among high-risk elderly populations, health officials aim to lower the frequency of heatstroke episodes and the associated long-term complications, such as the doubled risk of cataract development identified in the Japanese study.