A recent study has observed that women with healthy and normal emmetropic eyes have larger pupil diameter than men. Very little research has been done so far to gather information about emmetropic eye in comparison to myopic or heypermetropic eye.
Pupil is that portion of the eye which contracts and dilates in order to regulate the amount of light reaching the retina. Normal diameter of the pupil ranges between 3 to 4.5 millimeters. In the dark, pupils dilate and their diameter can measure between five to nine millimeters.
Non-pathological and normal emmetropic eyes are the most common type of eyes found in almost 43.2 percent of the population. Approximately 60.6 percent of children in the age group three to eight years and 29 percent in people aged 66 years and above have emmetroipc eyes.
The study of emmetropic eyes for understanding their anatomical pattern will serve as a model during comparative studies with eyes having refractive defects like hypermetropia, myopia, stigmatism or pathological disorders like cataract. The study led by Juan Alberto Sanchis-Gimeno, researcher at University of Valencia was gender based.
Parameters like central cornea thickness, minimum total cornea thickness, distance of white-to-white portions and diameter of pupil were taken from approximately 379 emmetropic participants. This is the first of its kind study to analyze anatomical indexes from a large sample population of emmetropic subjects.
Observations did not bring out marked differences in the parameters measured but for the fact that healthy emmetropic women have larger pupil than men. Further research is still required to be done in this field to analyze and clarify whether differences exist in anatomical indexes between emmetropic, myopic and hypermetropic eyes. The study should be done across various populations having different ethnic origins.
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