Semifinished Bifocal Ophthalmic Lens Blank

Semifinished bifocal ophthalmic lens blanks are a type of lens material used in the production of bifocal eyeglass lenses. These blanks are typically made from high-quality optical materials, such as glass or plastic, and are designed to be further processed and customized by an optician or lens manufacturer.

Bifocal lenses are used to correct both near and distance vision in individuals who have presbyopia, a condition that affects the eye's ability to focus on close objects. The lens blank itself contains two distinct optical powers: one for distance vision and another for near vision. The transition between these two powers is typically marked by a visible line on the lens.

The term "semifinished" refers to the fact that these lens blanks are not yet in their final form. They require additional grinding, shaping, and polishing to be transformed into a finished bifocal lens that can be inserted into an eyeglass frame.

Semifinished bifocal ophthalmic lens blanks are classified under the supply class "Ophthalmic Instruments, Equipment, And Supplies" within the larger supply group "Medical, Dental, And Veterinary Equipment And Supplies." This classification helps to categorize and organize the various products and materials used in the field of ophthalmology and eyecare.

Overall, semifinished bifocal ophthalmic lens blanks play a crucial role in the production of bifocal eyeglass lenses, allowing for the customization and creation of lenses that address both near and distance vision needs.