Women are the pupils larger than males

women are the pupils larger than males

the study has been published in ‘ Surgical and Radiologic Anatomy ’

Spain, may 2012.- from an anatomical point of view, to the normal eye and non-pathological is known as emétrope eye, and it has been studied very little so far compared to the short-sighted and the hipermétrope. The results show that healthy emétropes women have one pupillary diameter greater than males.

eye emétrope, normal and not pathological, is the most common type among the population (43.2%), with a percentage ranging from 60.6% in children aged three to eight years to 29% in those over 66 years.

Therefore an investigation now determines its anatomical pattern as a comparative model with the eyes with refractive defects (myopia, hyperopia, astigmatism) and Pathologic eyes (as those who suffer from cataracts).

Know very little emétrope eye despite the fact that it should be used to compare it with his eyes narrow and far-sighted ”, explains to SINC Juan Alberto Sanchis-Gimeno, first author of the study and researcher at the University of Valencia.

The work, published in the journal Surgical and Radiologic Anatomy, shows the values by gender of the central corneal thickness, the minimum value of the thickness corneal of the totality of the cornea, the white/white distance and pupillary diameter in a sample of 379 emétropes.

It is the first study that analyzes these anatomical indexes in a high sample of subjects emétropes and healthy ”, points Sanchis-Gimeno. In recent years new technologies, have been developed as the elevation corneal topography, that allow increasing the knowledge about eye anatomy in vivo.

Although research finds that there is no large differences in the majority of analyzed parameters, healthy emétropes women have one pupillary diameter greater than males.

From this work will be necessary to investigate whether there are differences in anatomical indices studied between emétropes, short-sighted and far-sighted eyes, and between peoples of different ethnic origin ”, concludes the researcher.

How does the human eye

Light penetrates through the pupil, passes through the lens and is projected onto the retina, where turns – thanks to the photoreceptor cells – in nerve impulses moved through the optic nerve to the brain. So the light rays that penetrate the eye can focus on the retina, must be used. Most of refraction occurs in the cornea, which has a fixed curvature.

For its part, the pupil is a fray and contractile opening that regulates the amount of light reaching you the retina. The size of the pupil is controlled by two muscles: the sphincter of the pupil, which closes, and the dilator muscle of the pupil, that opens it. Its diameter is between 3 and 4.5 mm in the eye, but in the darkness can reach 5 to 9 mm.

references

R Montes-Micó, Ferrer-Blasco T. Distribution of refractive errors in Spain ”. Doc Ophthalmol. 2000; 101: 25-33