1. The Mechanism: Physical Metal vs Infrared Light
To understand why optical switches have taken over competitive esports, you must look at how each switch registers an actuation:
Relies on physical metal contacts (copper, silver, gold alloy). Pressing the button causes a curved leaf spring to snap downward, striking the contact terminal.
Uses an infrared light beam inside the mouse housing. Pressing the button opens a tiny mechanical shutter, allowing the light beam to strike a phototransistor instantly.
2. The Double-Click Paradox: Can Optical Switches Ever Double Click?
No—not from electrical contact chatter. Because optical switches contain no electrical contacts striking each other, there is no physical bounce voltage waveform for the controller to misinterpret.
However, there is one rare exception: if the physical plastic plunger or the mouse button shell's plastic tension peg breaks or chips, physical mechanical rattle could briefly block and unblock the infrared beam twice. But in 99.9% of scenarios, optical switches completely eliminate the infamous double-clicking defect that plagued earlier mechanical mice like the Logitech G903 and original G Pro Wireless.
3. Head-to-Head Comparison: Optical vs Mechanical
| Metric | Optical Switches | Mechanical Switches |
|---|---|---|
| Click Response Time | ~0.2 ms | 4.0 ms - 12.0 ms (due to debounce) |
| Switch Lifespan | 70 - 100 Million Clicks | 20 - 50 Million Clicks |
| Double-Click Resistance | Immune to contact chatter | Susceptible over time |
| Tactile Feel & Crispness | Slightly hollow in Gen 1; excellent in Gen 3/4 | Traditional crisp, sharp tactile snap |
| Power Consumption | Requires active IR LED power (minor battery penalty) | Passive circuit (ultra-low power) |
| Drag Clicking Potential | Poor (cannot exploit bounce to double register) | Excellent (low debounce allows 25+ CPS) |
4. Which Should You Buy?
Choose Optical If: You play competitive FPS games (Valorant, Counter-Strike 2, Apex Legends, Overwatch), demand the lowest possible input latency, and want complete peace of mind that your mouse will never develop switch chatter defects.
Choose Mechanical If: You love heavy tactile clicks (e.g., Kailh GM 8.0, Huano Pink Dot), play Minecraft PvP where drag clicking and butterfly double-registering is a competitive advantage, or desire a battery that lasts 150+ hours on wireless.