The Top Portion (Distance Vision): The majority of the lens is tailored to your regular prescription, allowing you to see clearly far away. This part is used for everyday activities like driving, walking, or looking across a room.
The Bottom Portion (Near Vision): The lower section of the lens contains an added magnifying power, often shaped like a small "D" (a flat-top bifocal), a circle, or a rectangle. This segment is specifically designed for close-up tasks like reading a book, looking at a smartphone, or sewing.