![]() The purpose of this method is lessening the spherocylindrical refractive error by reducing the corneal curvature and diminishing the higher-order aberrations to increase the corneal regularity. The use of the intrastromal corneal rings was proposed in 1978 for myopia adjustment. Pentacam-HR calculates the optical corneal densitometry in the range of 0 (minimum scattering) to 100 (maximum scattering) in the Gray Scale Unit (GSU) criterion using the Scheimpflug imaging technology and provides a map of the posterior scattered light. ![]() 2, 3 It has been shown that the back-scattered light increases due to the damage to the collagen fiber arrangement and enhancement in the keratocyte density in the central parts of the keratoconic corneas 4 therefore, any changes in these two factors will alter the optical corneal densitometry. 1, 2 Some ocular diseases, such as keratoconus, reduce the corneal transparency and increase the scattering of light (depending on the severity of keratoconus), while others, such as high myopia reduce it. ![]() Optical corneal densitometry is referred to the value of the back-scattered light from the cornea, which can be used as a quantitative method for objective evaluation of the corneal health and light scattering in the cornea. ![]()
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