Definitions:

1. A piece of headgear with a brim or visor designed to protect the eyes from bright light, commonly used by people working under intense lighting conditions or by individuals in outdoor sports. NOUN
   • The eyeshade shielded the hiker's eyes from the sun's glare as he climbed up the steep mountain trail.
2. A soft padded mask worn over the eyes to block out light, typically used to help someone sleep better. NOUN
   • She always packs an eyeshade when traveling to ensure she can sleep on the plane.

Synonyms:

• eye mask
• peak cap
• sleep mask
• sun visor
• visor