How to calculate the power of the eye?

How to calculate the power of the eye?

K = D /(1 – dx D): this formula makes it possible to calculate the refraction of theeye (or the Powerful of a contact lens) from the Powerful of the corrective lens (D) and the lens-eye (d>0).

What is the power of the eye?

L’eye is therefore a complex optical system composed of several diopters, the Powerful total convergence is about 60 diopters.

What is high myopia?

The high myopia: also called myopia degenerative, exceeds 6 or 8 diopters, and implies a greater predisposition to cause complications and other associated ocular pathologies. In general, the higher the number of diopters is higher, the greater the risk of complications is big.

How is the retina made?

The retina is made up of a stack of layers, in the radial direction (from the surface of the retina to the back of the eye): (Fig. 3) Structure of the retina (modified drawing from Purves). peripheral bipolar cells, specific for rods.

What is the visual retina?

The retina Lining the back of the eye, the visual or nervous retina is where the light message coming from outside is translated into nerve signals sent to the brain. It is a very fine neuronal tissue, which is part of the Central Nervous System, 0.1 to 0.5 mm thick, organized in ten layers of cells.

How to know if the operation of the retina is effective?

Retina fragile, too fine, or badly fixed, it happens that the cause is genetic in rare cases. It will then be necessary to be careful to know if the operation will be effective or not. People with glaucoma or who have had cataract surgery are also more likely to experience retinal detachment.

What are the different types of cells in the retina?

The retina is made up of three layers of neurons. There are photoreceptors, light-sensitive cells that will capture light stimuli (composed of cones and rods). They are the deepest cells of the retina but the first to receive the light stimulus.