ANTHROPTOMETRY AND MORPHOLOGY

APPLIED ANTHROPTOMETRY AND MORPHOLOGY

It should satisfy both Anthroptometric and cosmetic needs.

Frame ideally makes parallel relation with eyes so that it neither touches eyebrows nor cheeks.

Eyes, nose, eyebrows, cheeks, eyelashes, ears and temporal head all supported by skull are leading organs plays important role in interaction of spectacle frame and human face.

Frame measurement, Frame selection and Frame fitting on Face.

1.EYES:

The round shape eyeball of diameter 25mm is placed within bony socket of human skull and is visible almond shaped palpebral aperture.

Horizontal width of aperture is around 30 mm. Vertical dimension varies from 10 to 12 mm.

The two eyeballs are placed at same level in most cases.

If it is not same, difference in level rarely exceeds 2 mm.

There are certain ocular structures like pupil center, limbus, lower eyelid and canthus are used as reference for various dispensing measurements.

2.NOSE:

Relation between frame and nose crest determines frame fits comfortably or not.

Figure shows root, crest, flanks and overall shape of nose which is important considerations for proper frame fit.

Figure shows the root of nose is situated at junction of nasal and frontal bone is followed by crest.

Bridge of the nose is elevation formed by nasal bones and  the area bridge o the spectacle frame rests on nose crest.

The relative levels of eyes and bridge of nose is critical selecting and fitting the spectacle frame

3.EYEBROWS:

The shape and position of eyebrows determines shape of eyewear that suit a wearer.

An ideal choice based on fact upper rim of front of frame should be either below or in line with position of eyebrows.

4.CHEEKS:

The position of cheeks relative to bridge of nose determines inclination of front of frame through angle of sides.

Vertical angle of frame is adjusted to ensure that the lower eyewire does not make any contact with the cheeks.

5.EYELASHES:

The length of eyelashes of the upper lid determines the minimum vertex distance of spectacle lens.

Ideally eyelashes should never make contact with back surface of lens.

6.EARS:

The position of ears beyond the plane of nose bridge determines the overall length of sides of frame.

Their position in vertical plane also determines the angle of sides.

The ear point lies at the bearing surface of the temple bend.

They are great importance to fit the spectacle frame for length to bend, angle of drop and pantoscopic tilt.

6.TEMPORAL HEAD

The distance between right and left temporal head of wearer's head, measured at level approximately 25-30 mm behind the nose crest plane around the ears.

It provides the facial width which determines required temple width of spectacle frame.