Hint: Helps people see
The answer to this puzzle is:
1. PERISCOPE
2. PRISM
3. GOGGLES
4. VIEW
5. PEEPHOLE
6. LENS
7. TELESCOPE
8. MONOCLE
9. SPOTLIGHT
10. SPYHOLE
2. PRISM
3. GOGGLES
4. VIEW
5. PEEPHOLE
6. LENS
7. TELESCOPE
8. MONOCLE
9. SPOTLIGHT
10. SPYHOLE