Updated 2025: Sunglasses size and shape guide | Onlylens

The size displayed on all products in our catalog refers to the horizontal width, in millimeters, of each lens, as illustrated below:

There is no definitive "right" size; it largely depends on personal taste. Everyone has their preferences and should feel comfortable with their chosen style. Additionally, many models are produced in a single size (UNIQUE). That said, we present the standard criteria for selection.

At OnlyLens, we recommend opting for a medium size, approximately 57.5 mm in height, considering that typical lens widths range between 45 mm and 70 mm. However, this depends on your face's dimensions and shape, as well as your personal preferences.

Standard Criteria

Two factors influence the choice of sunglasses size:

• Face Shape
• Head Size

Therefore, for larger faces or head sizes, a larger size is more appropriate, while smaller sizes suit more slender faces.

Choosing the Right Sunglasses Shape

The ideal size of sunglasses for each face shape can vary based on personal preference. However, general guidelines can assist in selecting the appropriate size:

• Round Face Shapes: It's best to choose sunglasses that are wider than the broadest part of the face, such as square or rectangular frames. These frames help elongate the face and create a more balanced appearance.
• Square Face Shapes: Opt for sunglasses that are slightly wider than the face, like rounded or oval frames. These frames soften the angles of the face, resulting in a more balanced look.
• Oblong Face Shapes: Typically, any size of sunglasses can look good. However, it's advisable to avoid sunglasses that are too small, as they can make the face appear smaller, and to avoid overly large sunglasses, as they can overpower the face.
• Triangle Face Shapes: Select sunglasses that are slightly wider than the face, such as rounded or oval frames. These frames help balance a narrow chin and forehead, achieving a more harmonious look.

Ultimately, the best size of sunglasses depends on your personal style and face shape. It's always a good idea to try on various sizes and styles before making a purchase to ensure you find a pair that you love and that complements your appearance.

Updated Guide

Rethinking Sunglasses Selection: Beyond Face Shape

Traditionally, selecting sunglasses has been guided by matching frame shapes to specific face shapes. However, recent insights suggest that this approach may be overly simplistic. Instead, focusing on factors like head size and the overall fit of the sunglasses can lead to a more flattering and functional choice.

Prioritizing Head Size Over Face Shape

Your head size, encompassing the width and height of your head, plays a crucial role in determining the appropriate lens size for adequate sun protection and visual comfort. The shape of the frames is secondary to ensuring that the lenses provide sufficient coverage.

Finding Your "Eyewear Sweet Spot"

To identify the optimal lens size:

• Width: The lenses should be roughly as wide as your face.
• Height: The lenses should extend from the center of your eyebrows to about two-thirds down your nose.

Frames that fit within this "sweet spot" offer the best balance between functionality and aesthetics, ensuring ample sun protection without overwhelming your facial features.

Starting with Rounded Frames

Rounded frames, characterized by a slightly curved top and bottom, are universally flattering and serve as a great starting point for most individuals. They strike a balance between classic and contemporary styles, making them versatile for various looks.

Adjusting Frame Style Based on Personal Preference

While rounded frames are a safe bet, don't hesitate to explore other styles based on your head size and personal taste. For instance, larger heads might benefit from larger lenses, making square frames a suitable option. Ultimately, the goal is to find frames that fit well within your "eyewear sweet spot" and align with your style preferences.

Conclusion

When choosing sunglasses, it's beneficial to move beyond rigid face shape guidelines and consider factors like head size and overall fit. By focusing on these aspects, you can select sunglasses that not only provide optimal sun protection but also enhance your personal style.