Photochromic S/F Bifocal

Product Name:               photochromic finished SV 

Surface:                           Spherical/Aspherical

Index:                              1.56/1.60

Color:                              Gray/Brown/Pink/Purple/Green/Blue/Orange/Orange/Yellow        

Diameter:                        65/70mm

Material:                          CW-55

Manufactory:                   CHUNGHO(Korea)

Refractive Index(25¡æ):    n(d)=1.55   n(e)=1.553

Abbe Value:                     35

Specific Gravity(20¡æ):     1.27

Relationship between light transmittance(T) and Illumination time/sec.

Fig.1. The light transmitiance(T)of photochromic gray lens

as a function of illumination time.The temperature is 22¡æ(22D )and 32¡æ(32D )respectively.

This experiment was operated in shanghai that located at 33¦Ú N

Relationship between light transmittance(T) and Illumination time/sec.(no illumination)

Fig.2. The light transmitiance(T)of photochromic gray lens

as a function of illumination time.The temperature is 22¡æ(22D )and 32¡æ(32D ) respectively.

This experiment was operated in shanghai that located at 33¦Ú N

The light transmitiance(T)of photochromic gray lens

as a function of illumination time.The temperature is 25¡æ.

The time is 900 seconds. Transmittance 25.7£¥.

The light transmitiance(T)of photochromic gray lens

as a function of illumination time.The temperature is 25¡æ.

The time is 300 seconds. Transmittance 79.22£¥.Semi-bright is 1.8 minutes