A device for removing a surface layer of corneal epithelium, comprising: an elongated head having a length ranging between 5-13 millimeters, and having a distal end having a length ranging from 4-10 millimeters formed by an elongated edge of a cutting blade positioned in parallel with a distal edge of a control blade , characterized by the edge of the control blade and the elongated edge of the cutting blade being separated by a uniform gap having a width ranging between 0.02 to 0.2 mm and forming a distal opening to an elongated channel running from an anterior end to a posterior end of the head, said channel enclosed by two oppositely facing inner walls of the control blade and the cutting blade and having a sack-like cross section defining a broad proximal base and a narrow distal opening at said gap, wherein said inner walls are concave, and wherein the elongated channel is formed by the concave inner walls, and wherein the channel is configured to collect any combination of peeled epithelial tissue and released residue, and wherein the elongated edge of the cutting blade extends distally beyond the distal edge of the control blade providing a height differential ranging from 0.05-0.5mm between the elongated edge of the cutting blade and the distal edge of the control blade, and wherein the elongated edge of the cutting blade is sharp, having outer edges forming an acute angle ranging between 10°-50°, and configured to cut a bodily tissue, and wherein the distal edge of the control blade is dull, having outer edge forming a rounded corner with a radius ranging from 0.05mm-0.1mm, and configured to form a barrier that limits the depth of penetration of the elongated edge of the cutting blade into the bodily tissue. an elongated head having a length ranging between 5-13 millimeters, and having a distal end having a length ranging from 4-10 millimeters formed by an elongated edge of a cutting blade positioned in parallel with a distal edge of a control blade , characterized by the edge of the control blade and the elongated edge of the cutting blade being separated by a uniform gap having a width ranging between 0.02 to 0.2 mm and forming a distal opening to an elongated channel running from an anterior end to a posterior end of the head, said channel enclosed by two oppositely facing inner walls of the control blade and the cutting blade and having a sack-like cross section defining a broad proximal base and a narrow distal opening at said gap, wherein said inner walls are concave, and wherein the elongated channel is formed by the concave inner walls, and wherein the channel is configured to collect any combination of peeled epithelial tissue and released residue, and wherein the elongated edge of the cutting blade extends distally beyond the distal edge of the control blade providing a height differential ranging from 0.05-0.5mm between the elongated edge of the cutting blade and the distal edge of the control blade, and wherein the elongated edge of the cutting blade is sharp, having outer edges forming an acute angle ranging between 10°-50°, and configured to cut a bodily tissue, and wherein the distal edge of the control blade is dull, having outer edge forming a rounded corner with a radius ranging from 0.05mm-0.1mm, and configured to form a barrier that limits the depth of penetration of the elongated edge of the cutting blade into the bodily tissue. <EOS>