Optometry is much more than a “pair of glasses” or an eye exam, it is in fact a professional service dedicated to scientific analysis and improvement of vision and it must be considered as a learning process and as a fundamental phenomenon for the best fit of the individual in the world that surrounds him ”. (Snellen)
Before talking about sight defects it is mandatory to mention EMMETROPIA: the eye is in a good shape, it sees everything and and the images are perfectly focused on the retina.
When the visual conditions do not respect this state, one enters finds himself with REFRACTIVE ERRORS, that are divided into:
The infinite images of a myopic eye will come into focus before the retina, resulting in a blurred vision. This is due either to the conformation of the eye that is too long or to a high refractive power.
It can be considered as the opposite of myopia, therefore images from infinity will come into focus beyond the retina. This is due either to the conformation of the eye that is too short or to a low refractive power.
It is a defect due to the fact that the cornea is not spherical, it will therefore be possible to see images that are not perfect in one position with respect to the other. The ocular structure is similar to a rugby ball rather than a soccer ball.
It is not a refractive error but a physiological defect that occurs to everyone older than 42–45 years. Focusing closely, a function performed by the crystalline lens, is gradually less due to aging.
To ensure efficiency and comfort in the use of your glasses, constant vision control is advisable. Our opticians – optometrists will also be at your disposal to detect any changes to the visual defect that have occurred over time.
WARNING: It needs to be clarified that the visual examinations and professional services provided by Occhial House s.r.l. and by its collaborators, they are not medical-oculistic activities.
Sunglasses or sports glasses must be chosen with great care, taking into account not only factors such as aesthetics and fashion, but also and above all, the need for adequate and specific protection from harmful radiation. The sunscreens must therefore respond to precise technical requirements and protect the eyes in different situations of ambient light. The protection must reflect 100% UV protection as the threat of ultra violet (UVA – UVB from 280 to 380 nm in fact) can threaten the health of the eyes and surrounding textiles.
Furthermore, each subject has a different sensitivity to various colors, therefore we advise everyone to undergo a simple chromatic test, which can be performed in our centers in a few seconds, to determine the color of the filters for optimal protection of your eyes.
- Myopic: brown lenses
- Hypermetropic: green lenses
- For retinal problems, photophobia and cataract: lenses with red tendency.
It is important for your safety to take into account that filters (or lenses) with a light absorption greater than 25% cannot be used for night driving, and that filters (or lenses) with light absorption of more than 92% or with colors that do not allow you to distinguish the road signs are prohibited for daytime driving too.
The natural classification of the lenses according to personal needs
- photochromic lenses
- progressive lenses
- monofocal lenses
Monofocal lenses possess only one dioptric power and are used to correct simple ametropias, such as myopia, hypermetropia and astigmatism. In the case of astigmatism or presbyopia they improve focus from near, while in myopia from far. In the case of a high refractive index, aspherical lenses are recommended, capable of guaranteeing optimal focusing.
These are lenses for eyeglasses that automatically darken when exposed to the UV rays of the sun and lighten when exposure to sunlight ends. They also have the advantage that the intensity of the color of the lens adapts to the intensity of the light present in the environment in a gradual way. The photochromic lenses, therefore, help the eyes to adapt to different light conditions, allowing a comfortable vision, without straining the eyes.
Those who need reading glasses and and also manifest myopia, hyperopia or astigmatism, often are in search for glasses which corretcs all defects. With progressive lenses or even called “multifocal lenses”, different gradation needs can be satisfied simultaneously because a single lens is divided into three vision areas and allows different problems to be solved with a single pair of glasses
Video terminal (VDT)
The use of the video terminal has reached almost all of the daily operational use. In addition to work obligations, it is also widespread for leisure time, for this reason and for other reasons, different subjects complain of vision discomfort and not all due to an incorrect or unused correction of eye defects.
To be more precise …
The Office Eye Syndrome, considered a source of main malaise in the use of VDT may be due to:
- Incorrect or neglected eye defects
- Eye irritation from use of monitors
- Environmental chemical agents
- Irrational lighting
- Incorrect working distances and postures
Our task is to identify the cause and find a solution for you.
In fact, there is a lens, called a dynamic lens, specifically designed for a clear vision in the short and medium distance, a solution that is ideal for satisfying the needs of those who occupy several hours in front of electronic devices.
Continuous updates in the field of contact technology, followed diligently by our collaborators, have enabled Occhial House to always be at the forefront of new technologies and new materials, thus specializing our centers in technical applications such as: soft toric lenses (for astigmatism ), progressive contact lenses, keratoconus correction, hortocheratologic lenses, post refractive surgery, correction of all pathologies.
Rigid permeable “gases”, similar to rigid, but with a substantial difference: although they absorb liquids in low percentages they are permeable gases, in particular to oxygen and water vapor.
The soft, consisting of substances permeable to water, contain a percentage ranging from 25% to 79% and are thus divided into two families: low water content (below 50%) and high water content ( over 50%).
Glasses, lenses and sports therapies
All sports require specific interventions for spectacle wearers to allow them to deal with the required activity in the most casual way. Technical glasses and contact lenses perform these needs very well. Our centers are specialized and equipped to solve these problems with all the latest generation instruments.
Contact lenses allow the free practice of sports activities, in particular Ortocheratologia, leaving the face free from any impediment.
Even glasses can be tailored to tackle sports activities.
The Occhial House centers specialize in: