The vision chart is a precision instrument. Used to test the visual acuity of the human eye. The LCD displays the test as standard, the optometrist by the subjectivity of the patient
visual results as an aid to the foundation of vision diagnosis. That provides an accurate data reference for the preparation of glasses.
The graphics projector is optically identical to the slide projector. In essence, it consists of a lighting system and a projection system. The lighting system in turn consists of a filament lamp and a condenser whose mission is to illuminate the object.
An optotype is an optometric instrument used to assess visual acuity and color vision. The tables are called optotypes that are printed with letters, numbers and figures in different sizes, previously determined, and that are cataloged in tenths of vision.