You can get nearly all mods you need into contact lenses + glasses
7 slots (3 for lenses 4 for glasses), you usually want:
image link, smartlink, magnification, flare compensation, infrared, ultrasound, low-light, protective covers, vision enhancement
did I miss something?
Contact Lenses rating 3 capacity 3
Image Link takes up 1 Capacity
Smartlink takes up 1 Capacity
Flare Compensation takes up 1 Capacity
- you end up with an Availability of 12
Glasses rating 4 capacity 4
Ultrasound takes up 1 capacity
Vision enhancement rating 3 takes up 1 capacity
- you end up with an availability of 12
the availability is the cap here, but you have everything you need:
You keep on the lenses at all times and are protected against flashes and have that AR overlay for the Tacnet as well as the Smartlink ready at all times.
Even when you are glitching and thus falling down the stairs loosing your glasses, or whatever situation could arise.
You can put on/off your glasses as the situation dictates (or keep them on at all times) and get vision enhancement and ultrasound (which is arguably the best vision mod).
You can then go get 2 more mods for you glasses ingame.
Namely infrared and magnification.
Yes you can stack low-light UV T-rays and whatnot into your cybereyes as well as a laser but the GM-screen lists only the "basic" mods for modifiers hence you will probably end up with modifiers based on that chart and low light dosn't ever come into play unless in a situation where you can use a light source of your choice.
You get an additonal available capacity when you are a metatype with an appropriate vision mod already built in.
I don't remember if protective covers raise the availability so I left them out. (Always buying them never actually had any use of them yet).