Pictured are five different lens materials coded A-E across these five key ophthalmic indices n=1.498 (1.50) 1.53, 1.60, 1.67 and 1.74. 

All were subject to a drop ball impact of 0.48 joules 5 / 8^ths steel ball through 3 metres all were sourced stock -6.00DS at their manufactured regular CT’s.

Do you know which index is the toughest material?

You might be surprised by the results!

Here is your challenge, rate the lenses from toughest to weakest and email your answers to us at sales@ellivron.co.uk