1：Experimental Design and Method Selection:

Twenty pairs of eyeglasses were selected based on systematic random sampling to determine the amount of optical radiation transmission and level of attenuation by eyeglasses, in the wavelength range of 200nm to 900nm using 6405 UV/VIS spectrophotometer.

2：Sample Selection and Data Sources:

Commercial eyeglasses of different colours (colourless, brown, blue, gray, Purple, darkcolours) were purchased within Zaria markets, Nigeria. All samples were cut to a standard size of 1cm by 4cm to properly fit into the chamber of the spectrophotometer.

3：List of Experimental Equipment and Materials:

6405 UV/VIS spectrophotometer, micrometre screw gauge.

4：Experimental Procedures and Operational Workflow:

Measurements were carried out on the eyeglasses with the spectrophotometer set to measure %Transmittance from

5：0nm to 0nm at 0nm intervals. The linear attenuation coefficient, absorbance, and reflectance were calculated for each sample. Data Analysis Methods:

2 The average %transmittance was calculated for each region of the optical radiation (UVR, VR, IRR) for each sample.