A Study to Assess the Safety, Tolerability and Effect of Nexagon™ Applied to the Eye After PRK Laser Eye Surgery for Nearsightedness

Inclusion Criteria:

• Male or female pre-presbyopic myopes.
• Aged between 20 and 50 years inclusive.
• Females are eligible to participate only if they are currently non-pregnant and non-lactating. Females of child-bearing potential must commit to consistent and correct use of an acceptable method of birth control.
• Subjects willing and able to undergo bilateral PRK for the correction of their myopia.
• Subjects with MRSE <6.0 D, with less than 2.0 D of astigmatism.
• No more than 1.0 D of refractive difference between eyes.
• Stable prescription in both eyes as defined by <0.25 D change over the preceding 2 years.
• Subjects who are able to comply with all study procedures, including wearing a soft bandage contact lens in the immediate postoperative period.
• Subjects who are willing and able to give written informed consent to take part in the study.

Exclusion Criteria:

• Subjects who have a past or present disease, which as judged by the investigator may affect the safety of the subject or the outcome of the study.
• Subjects who have previously had corneal surgery.
• Subjects who require Mitomycin C following their PRK.

• Subjects with any ocular disease or corneal abnormality, including but not limited to:

  • Decreased corneal sensation / neurotrophic cornea;
  • Corneal vascularization;
  • Keratoconus;
  • Keratoconjunctivitis sicca requiring chronic treatment;
  • Lagophthalmos;
  • Blepharitis;
  • History of infectious keratitis;
  • History of glaucoma or intraocular pressure of >21 mmHg or use of glaucoma medications;
  • Significant dry eye disease that requires regular topical treatment;
  • Corneal thickness <480 µm at the thinnest point, and
  • Posterior elevation >40 mmHg.
• Subjects with corneal haze >+1 as assessed using the grading scale in the protocol.
• Subjects who require any topical ophthalmic medication other than the pre- and postoperative regimen defined in the study protocol.

• Subjects with:

  • Diabetes;
  • Collagen disorders associated with autoimmune diseases, e.g., lupus, rheumatoid arthritis;
  • Severe atopic disease;
  • Any systemic disease or condition where the subject is immunocompromized.
• Subjects who require any systemic medication that affects healing, e.g., steroids, hormone replacement therapy.
• Subjects who are taking amiodarone, long acting anticholinergics, e.g., atropine, scopolamine, or medications or agents that can cause dry eye.
• Subjects who have participated in a clinical trial within the 30 days prior to the date on which PRK is scheduled.