Name: 1.49 CR39 Flat Top Uncoated Prescription Bifocal Lenses For Presbyopes
Brand: Crystal Optical Co.,Ltd.
Price: 20 USD
Rating: 4.4 (5 reviews)

1.49 CR39 Flat Top Uncoated Prescription Bifocal Lenses For Presbyopes

‌ A flat-top bifocal lens is a specially designed lens that combines a single-light lens for distance vision and a bifocal lens for close reading. ‌ This design allows the wearer to switch between near and far vision on a pair of glasses, ideal for presbyopia or people who need to switch vision frequently.

Features of 1.49 CR39 Flat Top Uncoated Prescription Bifocal Lenses For Presbyopes

Division of visual area ‌ : There is a sharp division between the upper single-lens lens for looking far and the lower bifocal lens for looking close. The height of this boundary should not be lower than the pupil high line to ensure that the line of sight can naturally pass through the boundary when the near and far vision is switched to avoid visual discomfort.

Comfort and smoothness ‌ : Flat-top bifocals are designed to ensure that wearers remain fluid and comfortable when switching visions. Through personalized adjustment, the height of the boundary can be set according to the individual's pupil height, face shape and usage habits, thus providing a better wearing experience.

‌Appearance and functionality ‌ : The optical center is closer to the top of the child, reducing the appearance of jumping. However, the appearance of the flat-top double light is not as hidden as the dome double light, and the manufacturing requirements for the column mirror are higher.

Specification of 1.49 CR39 Flat Top Uncoated Prescription Bifocal Lenses For Presbyopes

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index	1.499
Material	CR39
Diameter	70/28mm
Power Range	SPH -6.00~ +6.00
ADD	0~ +3.00
Abbe Value	58
coating	UC
Coating clour	clear
Design	Flat Top

Advantages of 1.49 CR39 Flat Top Uncoated Prescription Bifocal Lenses For Presbyopes

The appearance design is different, the round top appearance is more beautiful, and the flat top is more obvious.

In addition, the two are also different in terms of visual effects and applicable scenes. The round top bifocal is suitable for people who use eyes for a long time at a distance, while the flat top bifocal solves the main problem of the round top bifocal and is suitable for people who use eyes for a long time at close range.