| Custom LASIK: Individualized vision correction: |
| Description: |
| Custom LASIK is a procedure that involves the use of a wave-front analyzer which enables your surgeon to customize the conventional LASIK procedure to your individual eye. This customized procedure can result in patients seeing clearer and sharper than ever before. |
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| The distinction between LASIK and Custom LASIK: |
| Custom LASIK uses equipment called the wave-front analyzer (aberrometer) to accurately measure the way light travels through the eye. The resulting map of the eye is then programmed into the laser, and the laser treats the eye based on the personalized 3-D map. |
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| Suitability: |
| Custom LASIK helps to treat ‘higher order’ aberrations, which are tiny imperfections in the optical system of the eye. They have a significant impact on quality of vision. In fact, higher order aberrations have been linked to visual glare and halos. Higher order aberrations have not been previously treatable with contact lenses, glasses or conventional LASIK. |
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| The benefits of custom LASIK: |
| Clinical studies have shown that Custom LASIK can improve not only what you can see but also how well you can see. In the past, doctors used a standard vision chart to measure vision. . If you could see the letters, the doctor would proclaim your vision as a number, such as 20/20, 20/100, and so on. But now, with Custom LASIK, doctors are also able to focus on the quality of your vision. Many patients who have undergone the Custom LASIK procedure, report clearer vision than ever before. It is as if someone had taken an ink-pad and freshly stamped each letter on the vision-chart in bold black letters. Since Custom LASIK corrects the unique imperfections in each individual's vision, it is likely that the patient will have improved night-vision. |
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| Ojas is a pioneer in the use of Custom LASIK in India. |
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Conventional refractive surgery such as LASIK or PRK only treats lower order aberrations like Defocus (Myopia, Hypermetropia) and Astigmatism. It is well known that there is a potential to induce higher order aberrations of 3rd, 4th, 5th order. |
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| Custom corneal ablation can treat lower order aberrations, but it also has the potential to resolve higher order aberrations such as Coma, Trefoil and others. Custom corneal ablation is a combination of two components: |
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| Aspheric Ablation |
| to preserve the prolate shape of the cornea & to decrease the risk for induced spherical aberrations and night symptoms of glare and halos. |
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Multipoint ablation |
| Using a 1mm spot to treat and irregularity component. |
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| Custom Ablation is divided in to 2 modalities of optional treatments: |
- Wavefront-guided (OPD) that can be with or without multipoint ablation
- Topography guided
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- OATz (Optimized Aspheric Treatment zone) to treat with aspheric ablation only.
- CATz (Customized Aspheric Treatment zone) to treat with aspheric ablation as in OATz but with multipoint ablation for the irregularity component.
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The Nidek NAVEX Platform has the ability to diagnose, analyze and to perform custom ablation. |
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There are 3 components: |
- The Nidek OPD Scan for diagnosis & mapping. It is a time – based wavefront sensor using a dynamic skiaosopy principal. In 0.4 seconds it can perform Auto-skiascopy, Autophotogrphy, Auto-keratometry and Auto-Aberrometry. Root mean square (RMS) is the value in microns used to represent the higher order aberrations (HOA).
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- The final fit software (FFS) imports the data from the OPD Scan, and generates the ablations, algorithms for the EC-CX III Excimer laser.
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- The EC-5000 CX III Excimer laser performs the treatment. It will allow the surgeon to correct both lower and higher order aberrations according to each patient individual unique treatment. This can result in improved visual acuity beyond the 20/20 vision.
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| Custom corneal ablation may be performed for primary cases or for enhancement treatments. Criteria that a refractive surgeon should consider for performing custom ablations are :- |
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Primary laser refractive surgery patients with higher order (RMS > 0.5m) aberrations.
- Previous refractive surgery patients with induced higher order aberrations.
- Clinically significant visual symptoms of glare or halos that reduce visual acuity.
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