Crested gecko eye cloudiness from wrong UV bulb

Eye cloudiness in a crested gecko after introducing a new bulb is a serious warning sign — it usually means the UV output was far too intense for a crepuscular species that naturally lives in shaded forest canopy. Getting heating and UV lighting right is the single most important factor in reptile health, and crested geckos are particularly vulnerable to UV overdose because they're designed for low, dappled light — not the high-output bulbs suited to desert species. Most cloudiness cases I see come from owners using tropical or desert full-spectrum bulbs that push UVI levels the gecko simply can't handle. Before I point you to the right solution, can you tell me what bulb you were using, what size the enclosure is, and how the bulb was positioned relative to where your gecko spends most of its time?

That's exactly the problem — a 5.0 compact at 20cm in an enclosed space is generating UVI levels appropriate for a desert species like a bearded dragon. Crested geckos need a UVI of around 0.5 to 1.5 at most, and that setup was almost certainly pushing 3 or above right where your gecko was basking. The cloudiness is likely UV photokeratitis — essentially sunburn on the eye tissue. You need to get him to a reptile vet promptly to confirm that and rule out infection, but you also need to completely change the lighting approach. Has the cloudiness affected one eye or both, and has he shown any other changes — lethargy, reduced feeding, hiding more than usual?

Good — switching it off was the right call immediately, and the vet appointment tomorrow is exactly what he needs. When you go, mention UV photokeratitis specifically and ask them to assess both corneas. Now, for when he's recovered and you want to reintroduce appropriate lighting — and crested geckos do genuinely benefit from low-level UVB, it's not optional — the product you want is the Arcadia ShadeDweller 7% UVB Kit. It's designed specifically for shaded-environment species like crested geckos, day geckos, and chameleons. It produces a gentle, appropriate UVI of 0.5 to 1.5 when mounted at the top of an enclosure, it's a linear T5 format so the output is even rather than hotspot-concentrated, and Arcadia publish their actual UVI data so you know exactly what you're working with. It comes with a controller unit and fits standard Exo Terra canopies. Do not use compact bulbs for cresties again — the concentrated beam is the core issue.

Yes, the ShadeDweller is specifically calibrated for that kind of enclosure size and mounting position. Mounted at the top of a 60cm tall Exo Terra, you'll get the right UVI gradient — higher near the top where he can choose to be if he wants UV, dropping off naturally as he moves lower. That choice is important for cresties; they're thermoregulators and UV-seekers, so giving them a gradient rather than bathing the whole vivarium in light is the correct approach. One additional note: once he recovers, reintroduce the lighting gradually — start with just two to three hours a day for the first two weeks so his eyes have time to adapt. And keep the enclosure temperature in the 22–26°C range; cresties don't need a basking spot, just ambient warmth and that gentle UV access.

That's the right order of operations — vet first, lighting change once he's on the mend. The ShadeDweller will serve him well for years if you replace the bulb annually even if it still looks lit, because UV output degrades before visible light does. Hope the appointment goes well tomorrow; crested geckos are resilient and if it is photokeratitis caught at this stage, most recover fully with the right care.