This Treatment Could Prevent Blindness Before It Starts

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Key points

• Innovative laser treatment for age-related macular degeneration Age-related macular degeneration (AMD) stands as a leading cause of blindness among the elderly.
• While maintaining a healthy diet and avoiding harmful habits, such as smoking, can help in prevention, there are cases where such efforts are not enough.
• Recently conducted research by a team of Finnish scientists sheds light on a promising approach to tackle AMD in its early stages, before it leads to blindness.
• This groundbreaking treatment involves the use of lasers.

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Innovative laser treatment for age-related macular degeneration Age-related macular degeneration (AMD) stands as a leading cause of blindness among the elderly. While maintaining a healthy diet and avoiding harmful habits, such as smoking, can help in prevention, there are cases where such efforts are not enough. Recently conducted research by a team of Finnish scientists sheds light on a promising approach to tackle AMD in its early stages, before it leads to blindness. This groundbreaking treatment involves the use of lasers. The rationale behind this method lies in the fact that macular degeneration results from damage accumulation in the eye’s cells, where proteins responsible for repairing such damage respond positively to heat. Yet, inviting heat into the delicate environment of the eye demands caution. Controlling the temperature in the eye is a challenging feat, as overheating could exacerbate the problem rather than provide relief. Fortunately, the compelling achievement of these scientists lies in their ability to measure real-time temperature within the eye, enabling them to reverse damage before blindness occurs. So far, this treatment has only been tested on mice and pigs, but due to promising results, plans are underway to initiate clinical trials on humans in spring 2026. Understanding how age-related macular degeneration causes blindness As with other body cells, eye cells suffer damage from aging, which can be accelerated by factors such as sun exposure or consumption of specific substances. When damage occurs, free radicals are released, causing further harm to the proteins within these cells. For proteins to function correctly, they require a specific folding structure. Improperly folded proteins lose functionality and may even become harmful. Thus, it’s crucial to eliminate these misfolded proteins as soon as possible. The eye possesses natural mechanisms to manage this process. The first measure involves activating heat shock proteins, which assist in properly refolding the misfolded proteins. If this method fails, a secondary approach consists of encapsulating these problematic proteins in vesicles, leading to their eventual digestion by enzymes known as lysosomal enzymes. As years pass, the effectiveness of these mechanisms diminishes. When this happens, misfolded proteins accumulate alongside metabolic waste deposits called drusen. These deposits form beneath the retina, progressively obstructing vision until blindness occurs. This condition is known as dry age-related macular degeneration, the most common variant. In France alone, AMD affects over 800,000 individuals, particularly those aged 75 and older, many of whom risk severe vision loss. Given the concerning prevalence of this condition, the findings from Finnish researchers are of significant interest. What does the treatment involve? As we’ve noted, the proteins involved in refolding misfolded structures are called heat shock proteins. Elevating the temperature within the eye can activate these proteins when they are inactive naturally. To achieve this, scientists have experimented with lasers, firmly monitoring that temperatures do not exceed 45 °C. In trials with pigs and mice, participants showed recovery from the early stages of macular degeneration, with many not experiencing blindness at all. Strikingly, improvements were also seen in the mechanisms regulating lysosomal enzymes. With clinical trials set to commence in spring 2026 in Finnish hospitals, the ambitious goal is for ophthalmologists worldwide to eventually administer this treatment. After all, once refined, this technique emerges as a relatively simple solution to a complex and serious issue. Yet, there remains a need for patience: first, clinical trials must confirm that everything proceeds smoothly.

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