The strength of 0.5 glasses is relatively weak. It is considered an "easy-wear" prescription, meaning it is a low prescription strength that is suitable for those with a slight refractive error. This type of prescription is generally recommended for people who have a very mild need for correction, such as those who need help with reading and computer work. In addition, 0.5 glasses are often recommended for those who want to wear glasses as a fashion accessory.
In terms of the actual strength of the prescription, 0.5 glasses only correct for a small amount of refractive error. This means that they can only provide a very small degree of correction, and may not be suitable for those with more severe vision impairments. Furthermore, it is important to note that a 0.5 prescription will not provide the same level of correction for everyone, as the amount of correction needed varies from person to person.
Overall, 0.5 glasses are considered to be a relatively weak prescription, and are usually recommended for people with only a mild need for correction. However, it is important to remember that this type of prescription may not be suitable for everyone, and it is always best to consult with an eye care professional to determine the best prescription for your individual needs.