There are significant differences between sunglasses and glasses in terms of definition, function, usage scenarios and types. The following is a detailed analysis of the difference between the two:

Definition:
Sunglasses: also known as sunshades, are glasses specially designed to block glare from the sun and reduce ultraviolet damage to the eyes. Sunglasses usually have colored lenses that can effectively block light while protecting the eyes from strong light stimulation.
Glasses: A combination of lenses and frames used to improve vision, protect the eyes or for decorative purposes. There are many types of glasses, including myopia glasses, hyperopia glasses, reading glasses, astigmatism glasses, plain glasses, etc., which are used to correct various vision problems.
Function:
Sunglasses: The main function is to block sunlight, reduce eye fatigue, and prevent ultraviolet damage. Polarized sunglasses can also reduce the interference of reflected light from water, snow, etc., and improve visual clarity.
Glasses: The main functions include correcting vision and protecting the eyes from external stimulation and damage. Different types of glasses have different functions, such as myopia glasses are used to correct myopia, and reading glasses are used to improve presbyopia, etc.
Usage scenarios:
Sunglasses: Suitable for outdoor activities such as driving, fishing, skiing, beaches, etc. to reduce the irritation and damage of the sun to the eyes.
Glasses: Widely used in daily life, work, study, etc. Specific types of glasses, such as computer goggles, are also suitable for scenes where electronic devices are used for a long time.
Types:
Sunglasses: According to the lens material, they can be divided into glass, resin (such as CR-39) and polycarbonate, etc.; according to the frame material, they can be divided into metal, plastic, plate and composite materials, etc. Sunglasses also have different lens colors and functional classifications, such as polarized lenses, photochromic lenses, etc.
Glasses: According to the purpose, they can be divided into myopia glasses, hyperopia glasses, reading glasses, astigmatism glasses, etc.; according to the lens material, they can be divided into glass lenses, resin lenses, etc. In addition, there are glasses for special purposes such as computer goggles, goggles, swimming goggles, etc.