Section 10.305 - Vision requirements(a)Deck standard.(1) A mariner must have correctable vision to at least 20/40 in one eye and uncorrected vision of at least 20/200 in the same eye. The color sense must be determined to be satisfactory when tested by any of the following methods or an alternative test acceptable to the Coast Guard, without the use of color-sensing lenses: (i) Pseudoisochromatic Plates (Dvorine, 2nd Edition; AOC; revised edition or AOC-HRR; Ishihara 14-, 24-, or 38-;plate editions).(iii) Titmus Vision Tester/OPTEC 2000.(v) Richmond Test, 2nd and 4th edition.(2) Applicants for an STCW endorsement must have correctable vision to at least 20/40 in both eyes and uncorrected vision of at least 20/200 in both eyes. A mariner who previously met these requirements and who suffers loss of vision in one eye after being issued an MMC is subject to the requirements of paragraphs (c), (d), and (e) of this section, as applicable. A mariner holding an MMC prior to January 1, 2017, must continue to meet the requirements of paragraph (a)(1) of this section.(b)Engineering, radio officer, tankerman, and MODU standard. A mariner must have correctable vision to at least 20/50 in one eye and uncorrected vision of at least 20/200 in the same eye and need only the ability to distinguish the colors red, green, blue, and yellow. The color sense must be determined to be satisfactory when tested by any color-vision test listed in paragraph (a) of this section, or an alternative test acceptable to the Coast Guard, without the use of color-sensing lenses. The Coast Guard will accept Farnsworth D-15 Hue Test as a color vision test to meet the requirements of this paragraph.(c)Vision waiver. Any applicant whose uncorrected vision does not meet the 20/200 standard and is correctable to listed standards above may be granted a medical waiver in accordance with § 10.303 of this subpart. If a vision waiver is granted, a limitation will be placed on his or her a medical certificate indicating the mariner may not serve under the authority of the endorsement unless corrective lenses are worn and spare lenses are carried onboard a vessel. Waivers are not normally granted to an applicant whose corrected vision in the better eye is not at least 20/40 for deck officers or 20/50 for engineer officers.(d)Vision operational limitation. If corrective lenses are required in order to meet the vision standards above, a mariner may not serve under the authority of the endorsement unless corrective lenses are worn and spare lenses are carried onboard a vessel. This operational limitation will be placed on his or her medical certificate.(e)Loss of vision. A mariner having lost vision in one eye must wait 6 months from the date of the vision loss before submitting any application, and must provide a statement of demonstrated ability on his or her medical examination.USCG-2004-17914, 78 FR 77900 , Dec. 24, 2013, as amended by USCG-2018-0874, 84 FR 30881 , June 28, 2019