Problems with the angle of view of the eye, ordinary good eye imaging, like at the focal point?

Let me help you with this question, there is an essential difference between your two pictures, that is, the above picture sees an object at a finite distance, so it passes through the human eye and becomes an image corresponding to the perspective of the human eye. For the diagram below, the human eye is looking at an infinite object, and the infinite object is a point when it falls on the human eye. If the eye is a healthy eye (no myopia, astigmatism, etc.), then after the infinite target passes through the human eye, this point of light will only fall on one cell of the retina, just like focusing the sun's light with a magnifying glass.

Generally speaking, if we directly observe the image of the target coming out of the collimator with the human eye, we will find that no matter where you observe from the outlet of the collimator, the size and angle of the image are unchanged. What you see is that the parallel light emitted from each point of the object at all angles converges into the eye, and finally becomes an image. Therefore, the drawing method of the following picture will be misleading, so you should understand it carefully.

The term node is inaccurate, it should be called "node", for the node of any optical system, it is defined as two points with angular magnification equal to 1 on the axis, and for extra-axis rays, there is a plane with angular magnification equal to 1, called "node plane", generally, the node plane of a single thin lens is at the vertex of two faces. If the human eye is assumed to be a convex lens, then the node is the curvature vertex of the two convex surfaces.

The image that the eye sees as an upside-down shrinkage on the retina becomes a normal image after being processed and magnified by the optic nerve of the brain.

Summary. There are the following differences between super-angle fundus imaging and bi-field imaging: Over-angle fundus imaging is a technique that uses a fundus camera or scanner to obtain fundus images.

It helps ophthalmologists diagnose and monitor eye diseases such as diabetic retinopathy, glaucoma, etc. Super-angle fundus imaging uses high-frequency sound waves and optical scanning technology to observe fundus structures in real time, providing clear image details. Binocular vision imaging is a technique that scans the eye in a panoramic way.

It provides a wider field of view and helps doctors get a complete picture of eye lesions. Dual-vision imaging is widely used in the field of ophthalmology to detect retinal diseases, macular degeneration and other eye problems. In general, super-angle fundus imaging focuses more on the detailed observation of fundus structure, while dual-vision imaging focuses on providing a wider field of view to help doctors comprehensively assess the health of the eye.

Both of these techniques play an important role in ophthalmic diagnostics and**. Hope this helps!

There are the following differences between super-angle fundus imaging and bi-field imaging: Over-angle fundus imaging is a technique that uses a fundus camera or scanner to obtain fundus images. It helps ophthalmologists diagnose and monitor eye diseases such as diabetic retinopathy, glaucoma, etc.

Super-angle fundus imaging uses high-frequency sound waves and optical scanning technology to observe fundus structures in real time, providing clear image details. Binocular imaging is a technique that performs a panoramic scan of the eye. It provides a wider angle of vision to help doctors get a complete picture of eye lesions.

Dual-vision imaging is widely used in the field of ophthalmology to detect retinal diseases, macular degeneration and other eye problems. In general, super-angle fundus imaging focuses more on the detailed observation of fundus structures, while dual-field imaging focuses on providing a wider field of view to help doctors comprehensively assess the health of the eye. Both of these techniques play an important role in ophthalmic diagnostics and**.

Hope this helps!

Can you elaborate on that a little bit more?

Super-factory angle fundus imaging is different from dual-vision imaging. Fundus imaging uses a fundus camera or scanner to obtain fundus images to help doctors diagnose and monitor eye diseases. It utilizes sound waves and optical scanning technology to provide clear image details.

Dual-vision imaging is a panoramic scan that provides a wider field of view to help doctors get a complete picture of eye lesions. Both of these techniques are very important in ophthalmic diagnostics and pin ophthalmology.

Through the adjustment of the lens, different objects near and far are imaged on the retina, to see distant objects, the focal length of the lens becomes longer, to see near objects, the focal length of the lens becomes shorter, the lens of the myopic eye and the cornea are thicker, the convergence ability is stronger, the lens can not be adjusted automatically, when looking at distant objects, the image will be in front of the retina In order to make the image exactly present on the retina, the convergence of light rays should be delayed, so that the image is moved back relative to the lens, and the divergent lens should be worn, that is, the concave lens.

Hyperopia refers to a refractive state in which the parallel beam of light is refracted by the adjusted and relaxed eyeball and imaged behind the retina, which occurs when the refractive power of the eyeball is insufficient or its axial length is insufficient. The optical focus of this eye is behind the retina, so the image on the retina is blurred. In order to see distant objects clearly, the focus behind the retina should be shifted to the retina using accommodative force, which is usually corrected with a convex lens.

As we age, usually after the age of 40, the ability to adjust decreases, and I can no longer do focusing movements, just like the focal length ring on the monocular camera is stuck, and I can only see objects at a certain distance.

The focal point of the lens of the human eye will certainly not be on the retina.

It can be seen that when it is a real image, the image is always after the focal length, so the retina should be behind the lens.

Because the closer you are to the object, the larger the viewing angle, if the viewing angle is large, the image of the object on the retina will be larger, and the object seen by the eye will be larger So among the 4 options, a person 20m away, a high railing, and a bamboo pole 40m away are not as close as a small tree 18m high, so this 18m away tree has the largest image on the retina, and the object seen by the eye is larger

Therefore, choose B