Blue filter glasses are designed to protect your eyes from harmful blue light emitted by screens. The number of blue filters in the glasses usually depends on the brand and type you choose. If you're concerned about the effectiveness of the blue filter, it's best to opt for a reputable brand that specifically mentions blue light protection. In fact, excessive exposure to blue light can lead to digital eye strain and disrupt your sleep cycle. To reduce the impact of blue light, you can also follow the 20-20-20 rule: every 20 minutes, look at something 20 feet away for at least 20 seconds. If you're experiencing eye discomfort, it's advisable to consult an eye specialist for a comprehensive eye exam.