Yes, There are reasons behind the construction of sunglasses.

• One of the most important reasons is to protect our eyes from the sun by wearing sunglasses. UV radiation can cause a variety of eye problems, including cataracts, macular degeneration, and photokeratitis. 

• Sunglasses may help to decrease glare when driving or performing outdoor activities. They can increase visual comfort and clarity through reducing the quantity of strong light entering the eyes. 

• Sunglasses, sometimes known as fashion accessories, are used to create a style statement or to enhance one's attire.