Models are see through in edit mode

this is something that's been bothering me for a while and i've yet to find a solution.

sometimes when i'm editing a model the object is transparent in edit mode, i do not have wire turned on in display and limit selection is off.

Have tried to change face in preferences > theme but no luck. Also tried to change my clipping and it didn't help.

Is this a bug or am i missing something obvious?

Thanks.

The result of "End"/"Start" mast be as low as it possible. Now you have 299621/0.000001=296210000000 - it is very big! Increase the first value and reduce the second, so that the result of the division becomes less than million.