Suitability Criteria

Eye

Refraction

  • Hyperopes up to +5.00DS (Above this consider Implantable Contact Lenses/Clear Lens Exchange)
  • Myopes up to -10.00DS (Above this consider Implantable Contact Lenses/Clear Lens Exchange)
  • Astigmatism up to 5 DC (If more than 3DC present power must correlate to K Readings within 1 D and axis within 15°)
  • Pre operative binocular uncorrected visual acuity must not exceed 6/9
  • Note LASIK treatment is only advisable where there is adequate corneal tissue post surgery to sustain normal corneal function. This is a minimum of 250µm of untreated stromal bed. Mr Pillai prefers to leave a minimum stromal bed of 300µm

Amblyopia

  • Vision in the weaker eye must correct to 6/12 or better

Monovision

  • The patient should be a successful monovision contact lens wearer or undergo a contact lens trial for one month and usually the dominant eye is treated for distance. The non dominant eye is treated for reading
  • Up to 2D of anisometropia may be considered
  • Px must be counselled for the possibility of needing ‘booster glasses’ for night driving or fine close work)

Stability

  • Minimum age for treatment is  21 years; stability is required for at least two years
  • Myopes should not exceed a 0.75DS or 0.75DC change in the last 12 months
  • For hyperopes the cycloplegic value should be taken as the absolute one

Pupil size

  • As a result of the latest Wavefront technology pupils up to 9mm can be treated (depending on the available corneal tissue and aberrometry results)

Keratometry

  • Corneal curvature should be between 38D and 48D pre-operatively for Lasik. Predicted  post-op keratometry readings should be within 34D and 51D

Binocular vision

  • Small prisms controlled in contact lenses are fine for treatment. For vertical prism 1Δ is the absolute cut off. Patients with significant prisms in their glasses are not suitable

Contact lenses

  • Soft daily disposables must be removed at least 24 hours prior to consultation
  • Extended wear and soft toric lenses must be left out for at least two weeks prior to consultation
  • Rigid gas permeable lenses must be left out for at least one month (or one month for every 10 years of wear) prior to consultation
  • PMMA lenses must be left out for three months prior to consultation

Dry eyes

  • Contraindication – if there is a positive history of severe dry eyes without contact lenses or if regular lubrication is required or any underlying systemic disorder like autoimmune disease or connective tissue disorder
  • Other cases are relative contraindications and need to be assessed individually by Mr Pillai

To continue producing outstanding results some ocular and general health conditions are contraindicated for refractive surgery.

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