Refractive

Refractive

1. GLASS REMOVAL:

If you are planning for glass removal and to have a spectacle-free vision, here are a few basics you need to know about your visit to our hospital:

  • Investigations: Your ophthalmologist will be advising a few essential investigations to find out your eligibility to undergo the treatment and to decide the further management:
    • Refraction: Accurate measurement of your spectacle power is very essential. This is the guiding mark for the amount of laser to be utilized. It will take about 5-10 minutes for this test. Refraction may be repeated if the need arises so.
    • Corneal Topography: Measurement of the corneal powers, curvature, thickness, abnormal thinning, and presence of other corneal diseases is done by Corneal Topography (The Orbscan). It requires good patient cooperation depending on which it will take 10-20 minutes to complete it.
    • Aberrometry: This test is performed to find out higher-order aberrations and plan for the customized wave-front guided LASIK.
    • Dry Eye Testing: It is done by placing a paper strip on to your conjunctiva. It takes about 5 minutes. Treatment of dry eyes is essential prior to LASIK.
    • Indirect Ophthalmoscopy: This is used to do a complete retinal examination. Patients who wear high power glasses may have retinal abnormalities and need to be taken care of before LASIK. Retinal laser treatment may be required. This test will require about 15 minutes.
    • Other Ocular measurements: Measurement of length of the eye and other tests are adjunct to LASIK treatment and your ophthalmologist may advise the same.
    • Other Systemic Investigations: Routine Blood tests may be required as per the need. LASIK cannot be performed is you are suffering from any systemic disease.
  • Treatment services offered: Based on the investigations, surgeons advise, one of the following treatments will be offered to you:
    • Blade LASIK: Micro-Blade called as the microkeratome is used to create the flap (thickness 120-140microns). The instrument is positioned over the eye.
    • Blade-Free LASIK: Femtosecond Laser bea, is utilized to create a flap (90-110 microns) thinner, safer and more faster than the microkeratome.
    • Customized Wavefront Guided LASIK: Patients having higher-order aberrations (as determined by aberrometry) are suggested to undergo customized treatment as the Laser settings are purely based on your own individualized aberrometric values.
    • Advanced Surface Ablation: Cases in which flap creation is not possible but excimer laser can be used to reduce power, are subjected to advanced surface ablation.
  • Frequently Asked Questions about LASIK (click here to read FAQs)
  • Patients Testimonials (Click here to read the testimonials)

2. KERATOCONUS

  • What is keratoconus: It is a degenerative disorder of the eye in which structural changes within the cornea causing it to thin and protrude to assume a conical shape.
  • Why does it occur: In most of the cases, the cause is unknown. Few cases may be hereditary.
  • What are the symptoms suggesting it:
    • Mild blurring of vision (initial stages)
    • Frequent change of glasses
    • Sensitivity to light
    • Deteriorating vision
    • Ocular allergy
    • Poor night vision
    • Excessive rubbing of eyes.
  • How to diagnose it:Investigations routinely performed to diagnose it are a complete ophthalmological assessment, refraction, and corneal topography.
  • What is the treatment of it:
    • Intrastromal Rings: Thin semicircular PMMA rings are inserted in the corneal to flatten the conical part of the cornea thus returning it to a more natural shape.
    • Corneal Collagen Cross Linking: Riboflavin (Vitamin B2) drops are instilled and activated by Ultraviolet light. This causes strengthening of the corneal tissue and preventing the progression of keratoconus
    • DALK: In severe cases, the anterior part of the cornea (which is weak) is removed and a healthy strong cornea of a donor is implanted. Very severe cases require complete corneal transplantation.
    • Bosten Scleral Lenses: Special contact lenses are sometimes preferred when surgical intervention is not necessary.
    • Customized Contact Lenses: In early cases, customized contact lenses can be worn to help regain the quality of vision affected by keratoconus.

3. HIGH POWER GLASSES (10-20 Dioptres)

  • What treatment options are available: Patients with very high power of glasses cannot be treated with LASIK. These patients benefit by implantation of Phakic IOL (Intraocular Contact Lenses). These lenses are implanted inside the eye in front of the human crystalline lens thus modulating the total power of the eye and reducing your dependence on spectacles.
  • Do these phakic IOLs provide with long term benefit: Yes, Phakic IOLs are meant to reduce your spectacle powers to zero / significantly lower values that will help you to perform your activities without the need of high power spectacles for years to come.