Recently, the widespread use of photorefractive surgery has inspired its use in the setting of AK. Kandori et al. [42] reported four cases in 2010, where early stage AK was treated with standard topical therapy, but developed large corneal abscesses in the upper third thickness of stroma. These were removed using laser phototherapeutic keratectomy (PTK); all eyes experienced no disease recurrence and final acuities ranged from 20/16 to 20/25. This would seem to be a very promising modality, although its application to more deeper or more widespread infiltration may be limited.