SETO 1.499 Semi Finished Round top bifocal lens

Short Description:

Bifocal lens can be called a multi purpose lens. It has 2 different fields of vision in one visible lens. The larger of the lens usually has the prescription necessary for you to see for distance. However, this can also be your prescription for computer use or intermediate range, as you would normally be looking straight when you view through this particular part of the lens.The lower part, also called the window, typically has your reading prescription. Since you generally look down to read, this is the logical place to put this range of vision assistance.

Tags:1.499 Bifocal lens,1.499 round top lens,1.499 semi-finished lens

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Product Detail

Product Tags

Specification

SETO 1.499 Semi Finished Round top bifocal lens3_proc

SETO 1.499 Semi Finished Round top bifocal lens2_proc

SETO 1.499 Semi Finished Round top bifocal lens1_proc

1.499 round-top semi-finished optical lens
Model:	1.499 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin
Bending	200B/400B/600B/800B
Function	round-top
Lenses Color	Clear
Refractive Index:	1.499
Diameter:	70/65
Abbe Value:	58
Specific Gravity:	1.32
Transmittance:	>97%
Coating Choice:	UC/HC/HMC
Coating color	Green

Product Features

1) What's the importance of a good semi-finished lens to RX production?

a. High qualified rate in power accuracy and stability
b. High qualified rate in cosmetics quality
c. High optical features
d. Good tinting effects and hard-coating/AR coating results
e. Realize the maximum production capacity
f. Punctual delivery
Not just superficial quality, semi-finished lenses are more focus on the internal quality, such as precise and stable parameters, especially for the popular freeform lens.

2）What Are Bifocal Lenses?

Bifocals are two prescriptions combined into a single lens.
Bifocals were originated by Benjamin Franklin in the 18th century when he cut the halves of two spectacle lenses and fitted them into one frame.
Bifocals are needed because the distance glasses do not suffice to focus sufficiently for near. As age increases, reading glasses are required to read at a comfortable distance. Rather than taking out the distance glasses and putting on near glasses each time, a person who wishes to work at the near point could use the lower segment comfortably.
There are various types of bifocals available, from the round-top bifocal, flat-top bifocal to the executive bifocal.

3) What is the difference between HC, HMC and SHC？

Hard coating	AR coating/Hard multi coating	Super hydrophobic coating
makes the uncoated lens hard and increases the abrasion resistance	increases the transmittance of the lens and reduces surface reflections	makes the lens waterproof, antistatic, anti slip and oil resistance