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Wavefront Aberration, Corneal clinical trials

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NCT ID: NCT04698590 Active, not recruiting - Keratoconus Clinical Trials

Wavefront Guided Scleral Lenses for Keratoconus and Irregular Astigmatism

WFG Sclerals
Start date: January 15, 2021
Phase: N/A
Study type: Interventional

Aberrations are the spreading of light from a point focus. Aberrations of the eyes can be objectively evaluated with a wavefront aberrometer. Lower order aberrations such as defocus and astigmatism can be corrected with glasses and traditional/disposable soft contact lenses. Patients with ectatic corneal disease, such as keratoconus, or irregular astigmatism cause by surgery, trauma or disease, experience vision that is unlikely to be adequately corrected with glasses or disposable soft contact lenses due to higher order aberrations (HOA). HOA's cause halos, flare, glare, starbursts, doubling, smearing or ghosting of vision. Specialty contact lenses, such as scleral lenses, can be used to mask the irregularity of the cornea, reducing HOA's and improving vision. In many patients the resultant vision, though improved, still has some level of residual HOA's affecting the quality of vision. Custom scleral lenses with customized wavefront guided optics can be used to reduce residual HOA's and improve vision further. These lenses have been referred to as higher order aberration correcting scleral lenses or HOA correcting sclerals and wavefront guided scleral lenses or WFG sclerals.

NCT ID: NCT04597255 Not yet recruiting - Refractive Errors Clinical Trials

Digital Wavefront Sensing

DWS
Start date: December 2020
Phase: N/A
Study type: Interventional

A holographic optical coherence tomography (H-OCT) setup is used to detect the wavefront by means of phase reconstruction.