These are common types of recessed lights that are used in new construction and renovations: eyeball, baffle,  open trim, and glass.

Baffle Does an excellent job minimizing glare and reducing brightness.  This trim is most often used for general down lighting.

Recessed Lighting

Eye-ball type to  cast light directional

Glass lens type for wet locations like in showers or over tubs.

Open Trim Simple and most economical choice for recessed down light, this trim creates and attractive finished look.

Eyeball This trim provides the ability to control the direction of light. The eye-ball trim is most often used for wall wash applications and task lighting.

Baffles are often used for general down lighting.

Open trim is a simple and most economical choice

Glass Lens Glass types are used in damp locations such as in showers, above sinks, above tubs, and outdoors.