Each individual who notices any vision problems should undergo an eye-sight examination. You should remember that you do not need any referral to an ophthalmologist from your primary care doctor. The doctor assesses, among others, vision acuity, vision field and colour vision. In the next step the ophthalmologist looks at the elements of the vision organ that are accessible for examination – eye sockets, eyelids, eye mobility, and then, using relevant tools, he/she examines the front and back segments of the eye.
The majority of eye diseases manifests by vision acuity worsening, therefore this examination is an integral part of an ophthalmological examination. For a quick determination of the vision defect a so-called ‘automated refractometry’ is used, commonly known as ‘computed eye examination’. This is an examination that does not require any patient preparation and that provides information about the severity of the defect in a short time. However, this computed analysis can never replace full ophthalmic examination or be a direct base for corrective glasses prescription.
Vision acuity test with the use of the so-called Snellen’s charts is done separately for each eye. The patient stands at a defined distance from the chart (D) that contains lines of the so-called optotypes (letters, pictures) of different sizes. Each subsequent line (starting from the top one) contains smaller optotypes than the previous one. Additionally, the distance from which the optotypes should be seen at normal vision acuity is given at each line.