Hi all,

I am examining the feasibility of manufacturing a lens designed with Surface slope in sequential mode.

In this function, i found the surface slope is a dimensionless quantity (no units).

In practice, however, slope is sometimes expressed in degrees (tan−1ΔyΔx)(tan−1⁡ΔyΔx), as a percentage (tanΔyΔx),(tan⁡ΔxΔy), or as a ratio (1:tanΔxΔy). 

Additionally, it is confirmed that the tangential slope value appears as shown in the photo below. 

Could someone tell me if these numbers are tan(radians) or something else? thank you.