The appropriate size for sunglasses and eyeglass frames should be proportionate with the face size, which means that smaller eyeglasses frames and sunglasses are the best for smaller faces while larger eyewear look better on larger faces. The frame shape should contrast the shape of the face (rectangle frame with a round face).

The way that eyeglasses fit your face and head is also important. Frames that are too large or that don't fit the bridge of your nose properly can slip. Not only is that uncomfortable, but you also can get a headache if you're not looking through the optical centers of the lenses. Alternatively, if your glasses are too small, they will be uncomfortable to wear; they can pinch the sides of your head and leave red marks on your temples. They can also hurt you behind your ears or on your nose. Use these tips to assist you in choosing the best frame for your face.

Oval face
Almost any style works for oval face. Experiment with the latest looks, such as wraparounds or shields. Square shaped frames with gently rounded edges and higher temples also look good on an oval face.
Frame suggestions: Any frame shape

Round face
Frames should make the face appear longer and thinner. In general, look for frames equal to or slightly wider than the broadest part of the face. Minimize the curves and add definition with soft, angular, rectangular styles or double brow styles. Higher temples will create a longer profile. Sunglasses with brow bars also pull the eye upward, making the face appear longer.
Frame suggestions: Wider frames with angular / rectangular stylese

Diamond face
This face shape has wide or high cheekbones with a narrow forehead and chin. Oval sunglasses will soften the contour of the face, although softly curved square frames will work as well. Make sure the styles are no wider than the top of the cheekbones.
Frame suggestions: Oval, Square, Rimless

Square face
This face shape consists of a strong jawline, a broad forehead and wide cheekbones. Reduce the angles with soft, curvy styles that will give the face some definition such as cat-eye styles. The classic ovals also works well for this face shape.
Frame suggestions: Oval, Round, Cat Eyes

Oblong face
Widen and shorten the face with sunglass styles that do not extend beyond the widest part of the face. Round or square shapes will look great on this face. Frames with short horizontal and long vertical lines also work. Decorative or contrasting temples add width to the face.
Frame suggestions: Round, Square

Triangle face
This face has a narrow jaw and a wide forehead. Soften the lower portion of the face by accenting the eye area. Styles such as cat- eyes should angle outward at the top corner and be wide enough to balance the jawline. You can also try metal frames with rimless bottoms.
Frame suggestions: Frames with a Straight Top Line, Cat Eyes

SKIN

Pale complexions
Try lightweight frames or those with a touch of colour such as rose or amber. Tortoiseshell frames suit fair complexions (avoid darker versions) but clear, blue or green tinged frames tend to drain colour from cheeks.

Dark complexions
Olive, Mediterranean, Golden or Asian skin and dark hair can look stunning in silver, gold or clear frames – but avoid black which can be too heavy.

Dark/Black complexions
All metallic frames suit black skins and amber often works well – be very careful with black frames, which can look spectacular or awful!

HAIR

Soft and curly
Enhanced by delicate shapes, rimless frames and translucent colours

Very curly
Choose a frame that follows your hairline. Classic small frames are advisable

Short
Geometric frames, or rounder frames look best

Very short
Bold colours and designs, as well as decorative styles

Long hair
Try the frames with both your hair up and down, as the change in style may alter the look of the frames