الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Transepithelial PRK procedure eliminates both the corneal epithelium and stroma in a single step using an excimer laser. StreamLight™ is a new single step Transepithelial photorefractive keratectomy procedure in which the epithelium is removed first by phototherapeutic keratectomy (PTK) and then followed by PRK in a single surgery.
This study conducted on 60 eyes of 30 patients. In The right eye conventional PRK surgery was done while in the left eye Streamlight PRK surgery was done. All patients included in the study subjected to full History taking, complete ophthalmic examination, visual acuity (uncorrected and best corrected visual acuity), cycloplegic refractive error, slit lamp examination of anterior segment structures, fundus examination and pentacam using Oculyzer machine (Wavelight, Germany), corneal topography using Allegro topolyzer (Wavelight, Germany) and intraocular pressure measurement.
Postoperative follow up at 3rd day, 1week, 1month and 3 month. We evaluated the following: uncorrected distance visual acuity, corrected distance visual acuity, spherical equivalent. Epithelial healing was monitored using slit lamp on day 3; day 5 and 1 week. Postoperative pain level in each eye measured on a questionnaire on 1st and 3rd day and corneal haze was evaluated as proposed by Fantes et al.
On 3rd day both un corrected distance visual acuity and best corrected distance visual acuity of the eyes which had Stramlight PRK surgery was significantly better than the eyes which had conventional PRK surgery P value was (p<0.003) and (p<0.001) respectively. At 1st week, 1st month and the 3rd month the results were comparable. Pain level was significantly lower at 1st and 3rd day in the eyes which had Streamlight surgery (p<0.001).As regard time for epithelialization there is no significant difference between the two eyes although the eyes which had Streamlight PRK surgery showed higher level of complete healing than the eyes which had conventional PRK surgery.AS Regard corneal haze only two eyes of the eyes which had Streamlight PRK surgery had non-significant corneal haze (p=0.499)