If you do not have a HiDPI monitor attached, you may be able to force HiDPI (hi dots per inch) screen modes for your non-HiDPI monitor.
Keep in mind that LightWave only supports HiDPI OpenGL 3D viewports (and some other limited areas).
To enable HiDPI mode in OS X Mavericks or later
From the Terminal app:
Then, restart your Mac.
Look for "(HiDPI)" modes in: System Preferences | Displays | Resolution | Scaled
You may have to hold 'option' keyboard key while clicking on "Scaled" radio button to see more choices.