Astigmatic Cone

[DF07]

Hi everyone, I am new here so sorry if this is in the incorrect forum.

I have a Visual Optics exam on thursday in which I may be required to draw fairly accurate with-the-rule and against-the-rule astigmatic cones. My problem is they are hard to draw and i was wondering if anyone had any tips or short cuts for drawing them?:hammer: I understand this differences etc and i can draw them but it takes me a fair amount of time (which i wont have in the exam).

Thanks very much.

Dan

[GAgal]

I don't have any tips for you but good luck on your test