(physics) Calculating eye diameter

[rickymhoff]

Is it possible to calculate the diameter of the eye from front to back when you what kind of glasses the person needs? Like if someone needs -2 type of glasses is it possible to calculate the eye diameter?

If not would it be possible to determine someones eye diameter by determine the closest point at which the person can see sharp?

Thanks in advance, I've searched everywhere but couldn't find an answer.

This is what someone gave me to help but i don't know if its useful? I can't contact that person right now.

Thanks in advance.

 

[mgb_phys]

The diameter of the eye is roughly equal to the focal length of the lens times the refractive index of the goo( can't spell aqueus humor ) inside your eye.

Generally the radius of the eye is taken as 9.2mm and the focal length of the lens 16.67mm - look for "Indiana Reduced Eye Model"

 

[Moetasim]

I can say that it is not possible to calculate the diameter of the eye from front to back based on the prescription for glasses. The prescription for glasses is determined by the refractive power of the eye, which is affected by multiple factors such as the shape and size of the cornea, the length of the eye, and the curvature of the lens. The prescription does not directly correspond to the physical diameter of the eye.

However, it is possible to estimate the eye diameter by determining the closest point at which a person can see sharp. This is known as the near point of accommodation and is typically measured during an eye exam. The near point of accommodation is affected by the size and shape of the eye, so it can provide a rough estimate of the eye diameter.

It is important to note that the eye diameter can vary among individuals and can also change with age. Therefore, the near point of accommodation may not always be an accurate measure of the eye diameter. Other methods, such as using specialized imaging techniques, may be needed for a more precise measurement.

I hope this helps answer your question. If you have further inquiries, I suggest consulting with an optometrist or ophthalmologist for more specific information about your individual eye measurements.