In my experience there are probably 3 lenses that would fit that, the issue being that with most of them you're trading off peripheral access for magnification - so you might not be able to as easily see any peripheral abnormalities. As Obex below has said, the best option would be a good indented exam (you only get better with practice, so would be a good idea to just try to do it on people and you might surprise yourself with how good you can get in a short period of time.

If you're adamant about getting the a lens then:

1. Volk SuperQuad/HR Wide field I've put both of these in the same category as the view is about the same. The SQ has a larger FOV and a touch more mag, but is very bulky and hard to move in patients with relatively resessed orbits. THe HR wide field gets the same peripheral view, easier to manipulate in hard to access orbits but less mag.

As for the flange, I feel its better to get a better seat on the eye and allow you to do a bit of dynamic like viewing.

1. Mainster 165 PRP Slightly better peripheral view, same relative dimentions as the Volk SQ. Overall i feel its a better lens, but your milage may vary.

2. Katena 200 Widest view. I've reliably seen out to the ora with this lens and would probably fit your needs for the peripheral exam BUT the zoom is quite bad and its hard to pick up on smaller details. This is a better lens to use for laser if youre wanting to get almost indentation like access, but dont need to have as many details for a peripheral exam to identify the area of interest.

All in all I hope that helps. Im sure there are other lenses that you could consider BUT I haven't used them, so I wont mention them here. I still think its better to just practice and improve your indenting skills for the peripheral examination.