Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is Ips-provectus transmittance/contrast ratio?

### Inputs:
table_name: table, columns: ['Name', 'Nickname', 'Year', 'Advantage', 'Transmittance/ contrast ratio']

### Response:
SELECT Transmittance/ contrast ratio FROM table WHERE Name = ips-provectus