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. based on Ohio's soil classification. Standard for grading and compacting earth (AASHTO M 145). Soil classification.This invention relates to improving corneal refractive power in a manner consistent with other equilibrating natural lens sub-systems, particularly the aqueous humor.

It is believed that the corneal refractive power of a normally sighted eye is 5.5 diopters. At birth, approximately one-third of the corneal power of the eye is lost by reflex accommodation, lens growth, changes in the crystalline lens, and other changes, resulting in a young adult average of 4.2 diopters. The human crystalline lens grows for the first ten years of life, increasing in size by 7.5 to 10% annually.

The lens thickens almost directly with age. Most lens thickening is a result of swelling of the lens epithelial cells, pushing the cells into the lens fibers, rather than growth of the fibers themselves. The lenticular mass continues to grow until the age of 45. At this point, the lenticular mass begins to lose the majority of its elasticity, and the lens power also begins to deteriorate, resulting in refractive error. This is the time period when vision for an average person becomes impaired and the need for corrective refractive surgery arises.

An object of the present invention is to provide methods and compositions for promoting corneal growth to a level consistent with that of other equilibrating natural lens sub-systems, particularly the aqueous humor. An advantage is provided over prior methods which require the use of contact lenses or the injection of steroids into the anterior segment of the eye.

A further object of the present invention is to provide methods and compositions for promoting corneal growth to a level consistent with that of other equilibrating natural lens sub-systems, particularly the aqueous humor. An advantage is provided over prior methods which have required the use of contact lenses or the injection of steroids into the anterior segment of the eye.