Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How could we ignore the lens and pupils of eyeballs: Metamaterial optics
  for retinal projection   Retinal projection is required for xR applications that can deliver immersive
visual experience throughout the day. If general-purpose retinal projection
methods can be realized at a low cost, not only could the image be displayed on
the retina using less energy, but there is also the possibility of cutting off
the weight of projection unit itself from the AR goggles. Several retinal
projection methods have been previously proposed; however, as the lenses and
iris of the eyeball are in front of the retina, which is a limitation of the
eyeball, the proposal of retinal projection is generally fraught with narrow
viewing angles and small eyebox problems. In this short technical report, we
introduce ideas and samples of an optical system for solving the common
problems of retinal projection by using the metamaterial mirror (plane
symmetric transfer optical system). Using this projection method, the designing
of retinal projection can becomes easy, and if appropriate optics are
available, it would be possible to construct an optical system that allows the
quick follow-up of retinal projection hardware.

22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph