Core Insights - Presbyopia is a common visual issue that arises with aging, characterized by difficulty focusing on close objects due to decreased elasticity of the lens and reduced muscle adjustment ability [2][3] Group 1: Prevalence and Causes - A report indicates that 56.9% of the population aged 35 and above in China experiences presbyopia, which is exacerbated by increased screen time and close-up work [4] - The development of presbyopia is linked to the natural aging process, where the ciliary muscle's ability to adjust diminishes and the lens loses its elasticity [3] Group 2: Progression of Presbyopia - The degree of presbyopia typically increases with age, generally deepening by 50 degrees every five years. For instance, at age 45, the degree is usually around 100 degrees, increasing to 200 degrees by age 55, and reaching 250 to 300 degrees by age 60 [5] Group 3: Nearsightedness and Presbyopia - Nearsightedness and presbyopia are distinct conditions that do not counteract each other. Nearsightedness results from the eye's shape, while presbyopia is a physiological aging phenomenon [5][6] Group 4: Eyewear Solutions - It is advised to avoid purchasing ready-made reading glasses without proper fitting, as they may not meet individual needs. A professional eye exam is recommended to determine the correct prescription [7] - For individuals with both presbyopia and nearsightedness, suitable eyewear options include: - Bifocal lenses, which have distinct sections for distance and near vision [9] - Progressive lenses, which provide a gradual transition between different focal lengths without visible lines [9] - Single vision lenses used in combination for specific tasks, such as prolonged screen time [9]

Group 1 - The stock price of Mingyue Optical reported at 48.42 yuan on August 21, down 1.36% from the previous trading day [1] - The stock experienced a rapid rebound, with a price increase of over 2% within 5 minutes at 9:38 AM, reaching a high of 49.86 yuan [1] - The trading volume for the day was 84,800 hands, with a total transaction amount of 417 million yuan [1] Group 2 - Mingyue Optical operates in the household light industry, focusing on the research, production, and sales of resin lenses [1] - The company's product range includes myopia lenses, presbyopia lenses, and progressive multifocal lenses, widely used in the eyewear manufacturing sector [1] Group 3 - On August 21, the net outflow of main funds was 943,200 yuan, while the cumulative net inflow over the past five trading days was 2,022,080 yuan [1] - The funding situation indicates a short-term inflow trend, but a net outflow on that specific day [1]