Transepithelial Photorefractive keratectomy (tPRK) using the B+L Teneo 317 Model 2 Excimer Laser with end-treatment laser polishing using a fixed thickness of the additional layer of 5 μm.

Conventional Photorefractive keratectomy (PRK) with alcohol-assisted epithelium ablation. Then the aspheric ablation profile will be performed using the B+L Teneo 317 Model 2 Excimer Laser.

The visual acuity measurements will be assessed using Clinical Trial Suite (M&S Technologies, Niles, IL, USA) at 4 m in LogMAR scale under photopic light conditions. Corrected means spectacle corrected.

The visual acuity measurements will be assessed using Clinical Trial Suite (M&S Technologies, Niles, IL, USA) at 4 m in LogMAR scale under mesopic light conditions. Corrected means spectacle corrected.

The contrast sensitivity test consists in assessing the possibility to distinguish the alternation of white and grey fringes of difference contrast with difference frequency.

Contrast sensitivity will be assessed under photopic and mesopic light conditions using Clinical Trial Suite (M&S Technologies, Niles, IL, USA) device at 2.5 m.

The amount and disturbance of photic halo side effects will be assessed by the Halo Simulator: With this software tool the particant mimics the individual vision perception by adjusting a typical night scene image with the intensity and size of halo. The simulator utilizes a numerical scale to quantify the size and intensity of halos, ranging from 0 (none), 25 (mild), 50 (moderate), 75 (severe) to 100 (very severe).

The amount and disturbance of photic glare side effects will be assessed by the Glare simulator: With this software tool the particant mimics the individual vision perception by adjusting a typical night scene image with the intensity and size of glare. The simulator utilizes a numerical scale to quantify the size and intensity of glare, ranging from 0 (none), 25 (mild), 50 (moderate), 75 (severe) to 100 (very severe).

The epithelial healing process after photorefractive keratectomy treatment often comes along with the perception of some corneal pain. To assess the pain level, the participants will receive a self-administered pain questionnaire to fill out every day from the day of the surgery until they return for the 6-9 days follow up visit. An 11-point scale will be used to rate the self-reporting of pain, where 0 is 'None' and 10 is the highest level of 'Severe'. Higher scores indicate higher level of pain.

To assess the visual perception level, the participants will receive a self-administered visual perception questionnaire to fill out every day from the day of the surgery until they return for the 6-9 days follow up visit. A 4-point scale will be used to rate the self-reporting of visual perception, with 1 = 'Clear' and 4 = 'Very Poor' vision. Higher scores indicate poorer visual perception.

The visual acuity measurements will be assessed using Clinical Trial Suite (M&S Technologies, Niles, IL, USA) at 4 m in LogMAR scale under mesopic light conditions.

The visual acuity measurements will be assessed using Clinical Trial Suite (M&S Technologies, Niles, IL, USA) at 4 m, 80 cm and 40 cm in LogMAR scale under photopic light conditions. Corrected means spectacle corrected.

The visual acuity measurements will be assessed using Clinical Trial Suite (M&S Technologies, Niles, IL, USA) at 4 m, 80 cm and 40 cm in LogMAR scale under mesopic light conditions. Corrected means spectacle corrected.

The amount and disturbance of photic halo side effects will be assessed by the Halo Simulator: With this software tool the particant mimics the individual vision perception by adjusting a typical night scene image with the intensity and size of halo. The simulator utilizes a numerical scale to quantify the size and intensity of halos, ranging from 0 (none), 25 (mild), 50 (moderate), 75 (severe) to 100 (very severe).

The amount and disturbance of photic glare side effects will be assessed by the Glare simulator: With this software tool the particant mimics the individual vision perception by adjusting a typical night scene image with the intensity and size of glare. The simulator utilizes a numerical scale to quantify the size and intensity of glare, ranging from 0 (none), 25 (mild), 50 (moderate), 75 (severe) to 100 (very severe).

The epithelial healing process after photorefractive keratectomy treatment often comes along with the perception of some corneal pain. To assess the pain level, the participants will receive a self-administered pain questionnaire to fill out every day from the day of the surgery until they return for the 6-9 days follow up visit. An 11-point scale will be used to rate the self-reporting of pain. Higher scores indicate higher level of pain, where 0 is 'None' and 10 is the highest level of 'Severe'. Higher scores indicate higher level of pain.

To assess the visual perception level, the participants will receive a self-administered visual perception questionnaire to fill out every day from the day of the surgery until they return for the 6-9 days follow up visit. A 4-point scale will be used to rate the self-reporting of visual perception, with 1 = 'Clear' and 4 = 'Very Poor' vision. Higher scores indicate poorer visual perception.