[Basic Principles of Optics].

As an ophthalmologist, it is very important to know whether limited vision is caused by refractive problems or whether there is another pathology behind it. That's why refraction plays a key role at the beginning of every eye examination. Therefore, it is important to know the basic principles of optics. When fitting spherical and cylindrical lenses, it is interesting to know which properties the respective lenses have. One should also be aware of the optical paths and refraction laws when fitting spectacle lenses and prisms. In addition, when prescribing spectacle lenses, one should consider changes in the distance between corneal apex and spectacle lens and know conversions for the strength of contact lenses. Only if you have a deeper understanding of refraction and correction of refractive errors you will be able to adjust optimal vision aids for more difficult refraction conditions.