| CK | Control group |
| R4 | Exposed to red laser light at intensity level 4. |
| R6 | Exposed to red laser light at intensity level 6. |
| B2 | Exposed to blue laser light at intensity level 2. |
| B4 | Exposed to blue laser light at intensity level 4. |
| B6 | Exposed to blue laser light at intensity level 6. |
| RB2 | Exposed to combined red and blue laser light with blue light intensity set at level 2. |
| RB4 | Exposed to combined red and blue laser light with blue light intensity set at level 4. |
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