Saint Laurent SL578 Eyeglasses

Understanding your eyewear measurements ensures a proper, comfortable fit. Most frames list their measurements inside the arm in this format:

50 ▢ 18 – 140

Lens Width ▢ Bridge Width – Temple Length (all in millimeters)

Eyeglass Measurement Breakdown

Measurement	Description	Typical Range
Lens Width	Horizontal width of one lens	48–55 mm
Bridge Width	Distance between the lenses	16–22 mm
Temple Length	Length of the arm piece	135–150 mm
Lens Height	Vertical height of the lens (important for sunglasses)	30–45 mm
Frame Width	Total width across the front of the frame	120–145 mm

General Fit Recommendations

Size	Lens Width	Bridge	Temple	Best For
Small	Under 49 mm	16–18 mm	135–140 mm	Narrow faces
Medium	50–54 mm	17–20 mm	140–145 mm	Most adults
Large	55-59 mm	18–22 mm	145–150 mm	Wider faces
Oversize	Over 60 mm	18–22 mm	145–150 mm	Wider faces

If you need help selecting the perfect frame size, our team is always happy to assist.