Not only myopia

Orthokeratology: a fascinating world…

Orthokeratology is not a new procedure, but interest in it has grown significantly over the last decade, both in terms of research and in terms of clinical practice. In 1971 the International Orthokeratology Section of the National Eye Research Foundation defined orthokeratology as “the reduction, modification, or elimination of refractive anomalies, through the planned application of contact lenses.” This definition is still valid, while successful results can now be had in just a few days with a single lens instead of series of flatter lenses applied for periods of weeks or months.

How does it work?

Orthokeratology induces a temporary reduction of refractive defects by changing the shape of the cornea, thanks to the plasticity of the corneal tissue, especially of epithelium. If the amount of corneal modeling is controlled adequately, the power of the cornea can be varied in a highly exact manner so that refractive error is corrected. Generally, Orthokeratology can be applied in cases of medium-low myopia (less than 6 diopters) in hyperopia (up to 3 dioptres) and only in some cases of astigmatism. In more extreme ametropia, orthokeratology can reduce the defect without correcting it completely; this can be useful for those individuals who want to reduce their dependence on optical correction or who want to wear more aesthetically pleasing and functional glasses.

A new Italian Patent

In the summer of 2002, the patent for ESA® lenses was filed by Antonio Calossi. These lenses are manufactured with six curves developing on a biconical model. The ESA ® lenses have a very sophisticated geometry; however, the application procedure is unexpectedly simple. There is no need to reason in terms of inversion and ray of curvature, because the choice of the lens, as for the conventional RGP, is based on the value of sim K and on the corrective effect to be obtained. The availability of a set of test allows immediately checking the effect of the lens. ESA lenses for myopia can be applied for the correction of myopia up to 6.00 D, with astigmatism up to 1.75 D SR and CR oblique or up to 0.75 D.

Esa Lenses are exclusively distributed by Esavision Technology and manufactured by TS LAC – TS LAC

ESA lens for Myopia

Topography of a myopic treatment

How the Esa Lenses® work

ESA® lenses are lenses for orthokeratology for night-time use of the latest generation. The results are very quick: after the first night a significant improvement in visual is observed and the final result is obtained, in most cases, with a single pair of lenses within the first week. The ESA ® lenses are safe for use at night because they are manufactured in Boston XO ®, a hyper-gas-permeable material, which ensures maximum oxygen intake even with closed eyes.

Corneal map pre application

Corneal map post application

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Effectiveness and predictability

The results of a clinical study conducted at the Department of Ophthalmology at Hospital of Caserta showed that the cornea responds quickly to the application of the ESA ® lenses, with a significant flattening of the cornea and vision improvement already after 60 minutes of use. The shape of the cornea changes from prolate to oblate in one night and you can get a vision of 10/10 for all day after only a week of use. In most cases the final lens is the first applied and only in some cases it was necessary to replace with a second lens after the first test.


In collaboration with the Eye Bank Foundation of Mestre Venezia it was conducted a study of the cornea by confocal microscopy in patients with ESA ® lenses for night use. This sophisticated new technology allows us to analyze in vivo the cells of all corneal layers at the microscopic level. The clinical study results have shown that the application of ESA ® lenses for night use will not cause significant structural alterations, inflammatory or trophic corneal tissue. Similar results were seen by specular microscopy of the endothelium.


Stromal keratocytes: Confocal microscopy

ESA Toric Lenses

The treatment of important astigmatism is now possible. ESA Toric lenses are lenses with inverse geometry (or dual toric) , for the specific treatment of astigmatism. The results that can be obtained in the treatment of simple and compound myopic astigmatism are extremely encouraging.

Corneal map with pre and post application of ESA toric lens

ESA lenses for hyperopia

The treatment of hyperopia, presbyopia through the corneal curvature of the optical zone, is the latest frontier of research in the development of the family of lenses ESA. In carefully selected cases it is possible to obtain with the ESA lenses for hyperopia correction independence throughout the day, for both distance and for near.

Hyperopia Esa lens

Topography of a hyperopic treatment

Accredited Application Centers

The lenses ESA are applied only in qualified centers. To be an accredited center for the application of the ESA lenses you need to follow specific training and specialization course , which are scheduled regularly, and be in possession of a set of diagnostic lenses.

  • Myopia
  • Hyperopia
  • Astigmatism
  • Keratoconus
  • Post Lasik

The ESA lenses are the only ones CE marked .
For our lenses we have chosen TS LAC, certified laboratory to ensure the highest standards of quality and safety.

Would you like to become a qualified center for ESA lenses?