Please assess the completion status of the following clinical trial:

Trial Title: Preservative-free Topical Anesthetics for Post-PRK Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~Patients who are candidate for PRK surgery with~1. Myopia up to - 6 diopters or myopic astigmatism up to - 4 diopters.~2. Corneal thinnest pachymetry of 500 µm~3. Residual stromal bed more than 350 µm after epithelial ablation.~Exclusion Criteria:~Patients with~1. Corneal scars or dry eye disease,~2. Past ocular surgery,~3. History of contact lens wear,~4. Systemic diseases such as diabetes mellitus and autoimmune diseases,~5. History of oral analgesics abuse.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- Preservative-free topical anesthetics group (Type: EXPERIMENTAL): Patients in this group had the standard post-PRK treatment regimen in addition to the prescription of preservative-free topical anesthetics for pain control following single-step transepithelial PRK surgery in one eye.
- Preservative-free artificial tears group (Type: PLACEBO_COMPARATOR): Patients in this group had the standard post-PRK treatment regimen in addition to the prescription of preservative-free artificial tears as a placebo following single-step transepithelial PRK surgery in the other eye.

Based on this trial design, predict the completion outcome and termination type (if applicable).