- Corneal Surgery
Advanced Topography Guided Excimer Laser Advanced Surface Ablation
- Treatment
- Corneal Surgery
Advanced Topography Guided Excimer Laser Advanced Surface Ablation
Topography-guided, or Advanced Surface Ablation (ASA) is a laser surgery technique that involves removing the outer layer of the cornea (epithelium) to allow an excimer laser to reshape the corneal stromal layer, using the corneal topographic surface as a map to guide the treatment and address the refractive error.
This procedure can be used to reshape the cornea in situations where there are specific conditions that are causing the irregularity. These irregularities can distort the cornea reducing quality of vision.
Situations where this can be used are scarring from trauma or infection and early keratoconus. The treatment can be combined with correction of myopia (short-sight), hyperopia (long-sight) and astigmatism at the same time.
Detailed topographic scans of the surface contours of the cornea are taken. This information is entered into the laser, and an individualised laser treatment plan is calculated to reduce the irregularity of the anterior (front) surface of the cornea.
This procedure can be used to reshape the cornea in situations where there are specific conditions that are causing the irregularity. These irregularities can distort the cornea reducing quality of vision.
Situations where this can be used are scarring from trauma or infection and early keratoconus. The treatment can be combined with correction of myopia (short-sight), hyperopia (long-sight) and astigmatism at the same time.
Detailed topographic scans of the surface contours of the cornea are taken. This information is entered into the laser, and an individualised laser treatment plan is calculated to reduce the irregularity of the anterior (front) surface of the cornea.
How is it performed?
- 1.Performed under local anaesthetic in sterile treatment room / operating theatre.
- 2.Patient is laid flat on the laser treatment bed.
- 3.Sterile eyelid support is inserted.
- 4.Alcohol is applied in a small well to help loosen and remove the corneal epithelium
- 5.Excimer laser treatment applied to cornea.
- 6.Topical anti-inflammatory and antibiotic drops applied.