Here are some helpful pointers to keep in mind when choosing your next frame.
The frame needs to be in proportion to your face. That is the smaller frames are best for smaller faces. Another trick can be contrasting the frame shape with the shape of the face.

Balance out the features. Small or delicate faces with thin hair, lips and eyebrows should choose a smaller, delicate frames and vis versa.

Short faces can be made to look longer in a high-placed, light coloured temples.
Long noses or wide set eyes look best with a heavy, dark bridge that sits low on the nose.
Small noses or close set eyes look best with a high, thin, light bridge. Rimless styles are also flattering.
Close set eyes look best with frames that have a clear or lightly coloured nose area.
Fuller faces should be paired with wide styles that don’t sit on the cheeks.

Round
The frames should make the face appear longer and thinner. In general, look for frames equal to or slightly wider than the broadest part of you face. Minimise the curves and add definition with soft, angular rectangular styles. Higher temples will create a longer profile. Glasses with brow bars also pull the attention upward, making the face appear longer. Therefore suggestions include wider frames with angular rectangular styles.

Oval
Almost any style works for an oval face. Square shaped frames with gently rounded edges and higher temples also look good on an oval face.

Square
To reduce the angles of the square shaped face with its strong jawline, broad forehead and wide cheekbone, use soft, curvy styles that will give the face some definition. Higher temples or cats eyes will lengthen the face. Classic ovals are a perfect choice.

Rectangular
Widen and shorten the face with styles that don’t extend beyond the widest part of the face. Wear round or square shapes. The old John Lennon styles look great on this face. Frames with short horizontal and long vertical lines also work. Decorative or contrasting temples add width to the face.

Triangle
This face has a wide jaw and narrow forehead. Soften the lower portion of the face by accentuating the eye area. Temples should be placed high. Frames can be top heavy and angled inwards at the bottom. Styles like cats eyes should be angled at the top corners and wide enough to balance the jawline. You can also try semi-rimless frames (metal frames with rimless bottoms).

Heart
Minimise the upper portion of the face by choosing frames no wider than the forehead and angling outwards from the bottom corners. Temples shouldn’t be placed too high. Suggestions include very light colours and rimless styles.

Use this information to make the best glasses frame selection from Only Specs (Glasses starting from $49 complete).