Write a very short cover letter in British English to University Hospitals Plymouth NHS Trust for the job below that I found on jobsincare.com 

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                                                    Ophthalmic Imaging Technician with University Hospitals Plymouth NHS Trust in Plymouth

                                                     We are looking for an ophthalmic imaging technician to assist with covering weekend shifts and holiday cover. Additional shifts will also be possible depending on clinic requirements.   This is a great opportunity for student optometrists to gain experience of working in a hospital eye service, and solidify your knowledge of ocular pathology.   ***Preference will be given to internal Trust staff, as well as 'Priority' and 'At Risk' status including NHS At Risk staff throughout Devon who are able to display recent relevant experience as dictated by the Person Specification.***   The post-holder will be an Ophthalmic Imaging Technician with relevant experience. The post-holder will have knowledge of a range of ophthalmic conditions and will facilitate the assessment of patients.   The role involves performing vision assessments, visual fields, disc and macula OCT, and fundus photography on patients referred to the eye unit for new eye pathologies and monitoring existing eye disease.   About us  Primary Duties & Areas of Responsibility   Undertake Ocular Coherence Tomography imaging of patients.   Undertake Visual Fields Testing.   Undertake fundus photography (retina) of patients.   Undertake general clinical photography of patients.   Undertake specular microscopy of patients.   Undertake corneal topography of patients.   Undertake auto-refraction of patients.   Undertake visual acuity measurement of patients.     For further details please see attached JD&PS.