Core Points - The article discusses the condition known as photokeratitis, which is essentially a sunburn of the eyes caused by excessive exposure to ultraviolet (UV) light [4][10][11] - Symptoms of photokeratitis include redness, pain, tearing, swelling, light sensitivity, a feeling of having something in the eye, and blurred vision [1][2][4] - The article emphasizes the importance of eye protection from UV rays, especially in environments with high UV exposure, such as beaches and high altitudes [8][11] Summary by Sections Photokeratitis - Photokeratitis, also known as ultraviolet keratitis, is an inflammation of the cornea and conjunctiva due to UV exposure, leading to symptoms like headaches and temporary vision loss in severe cases [4][10] - Symptoms typically resolve within hours or days, and immediate rest and artificial tears can alleviate discomfort [4][10] Causes and Prevention - UV rays from various sources, including sunlight, tanning beds, and welding arcs, can cause photokeratitis [6][10] - The article highlights the need for protective measures, such as wearing sunglasses and hats, especially during peak UV hours [11][13] Related Eye Conditions - Pterygium, another UV-related eye condition, has a prevalence of approximately 9.9% in certain regions, characterized by a growth on the conjunctiva that can affect vision [10] - Long-term UV exposure can also lead to macular degeneration, cataracts, and even skin cancer around the eyelids [11][10] UV Light Information - UV light is categorized into three types: UVA, UVB, and UVC, with UVB being the most harmful to the eyes [16][17] - Sunglasses labeled "UV400" can block nearly 100% of UV rays, providing essential protection for eye health [13][11]

Group 1 - The core concept of sunscreen is to protect against ultraviolet (UV) rays, specifically UVA and UVB, with UVB being the primary cause of skin damage [2][3] - Sunscreen is necessary year-round, not just in summer, as UV rays can still be harmful during cloudy days or in indoor environments where UVA can penetrate glass [3][4] - There are two main types of sunscreen: physical (using barriers like hats and clothing) and chemical (using creams and sprays to absorb UV rays) [4][5] Group 2 - It is recommended to combine both physical and chemical sunscreen methods for optimal protection, as each has its advantages and disadvantages [5] - All demographics, including children, need to be mindful of sun protection, with specific recommendations for infants and young children to primarily use physical methods [5][10] - The SPF (Sun Protection Factor) and PA (Protection Grade of UVA) ratings are crucial indicators of a sunscreen's effectiveness, with higher values indicating better protection [6][8] Group 3 - Different environments require different levels of sunscreen protection, with specific SPF and PA recommendations based on activity and exposure [9] - When selecting sunscreen for children, it is advised to choose products with SPF 30 or higher and PA++ or higher, considering their unique skin characteristics [9][10] - The use of sunscreen sprays for children is discouraged due to the risk of inhalation and potential health hazards [12][13] Group 4 - Consumers should be cautious when purchasing sunscreen products, ensuring they check for proper labeling, SPF and PA values, and ingredient suitability for their skin type [14][15] - Proper application techniques are essential for effective sun protection, including applying sufficient amounts and reapplying every two hours during outdoor activities [15] - Sunscreen should be removed at night to prevent skin irritation, with specific cleaning methods recommended for different types of sunscreen [17]