Updated: Feb 2016 Please note that the AFCO staff are not medically qualified and that the decision regarding medical suitability for enlistment is determined by selection medical staff. The aim of this thread is to clarify the medical standards laid down to all applicants joining the Armed Forces. In general terms if an individual fails to meet the medical standard for a specific trade in one of the services, they will most likely do likewise in the equivalent trade in one of the other arms of the Services. Despite individual experience expressed to the contrary, the medical standards for entry are different for those currently serving personnel who may develop a condition in service which precludes entry, but does not always stop them continuing to serve after they have joined. Rather than enter into the semantics or fairness of the standards outlined below, those wishing to complain about it would be better off directing their complaint at the medical authorities who set the standard they get paid a lot more than me anyway. The following is an extract from guidance notes that are given to every applicant (which invariably remain unread!). Naval Service life can be mentally and physically demanding and you will need to be medically fit to meet the challenges ahead. The application process includes a full physical and medical assessment to ensure you meet the standards required. The final decision regarding fitness to join the Naval Service is made by Royal Navy medical staff when you join. There are pre-existing medical conditions and ongoing illnesses that may prevent you from joining the Naval Service. You should check the guidance below on eyesight standards and the sample list of pre-existing conditions. This table is for general guidance only as many conditions that are compatible with civilian employment and sport may be incompatible with military service. This list is not exhaustive, so if you have a medical condition that is not listed, or if you are unsure whether your medical history may affect your eligibility to join, please ask your Careers Adviser who will obtain clarification from medical staff or, if you prefer, you can talk direct to Royal Navy medical staff. Note: Careers Advisers and their office staff are not medically qualified and that all final decisions regarding medical suitability for entry are only made by appropriately appointed medical staff. Eyesight standards The minimum standards for uncorrected and corrected vision vary for different branches in the Royal Navy and are determined by RN medical staff. Whatever branch you are applying for, with the exception of Chaplain, your spectacle or contact lens correction must not be greater than +/- 6.00 dioptres. For Chaplains the correction must not be greater than +/- 7.00 dioptres. If you have impaired colour perception (colour blindness) this may restrict the branches that are available to you.