46 results about "Cone cell" patented technology

The present invention provides reagents and methods for modulating cone photoreceptor activity, and devices for assessment of cone photoreceptor activity.

The invention provides a human visual perception simulation-based self-adaptive low-illumination image enhancement method. The method is put forwards based on characteristics of low brightness and low contrast of a low-illumination color image and through researching an automatic adjustment process of pupils and photoreceptor cells for an environment. The method includes the following steps that: the adjustment process of the pupils for light is simulated, and the total brightness level of the image is improved; and the self-adaptive adjustment and control ability of eye vision for a low-illumination environment is simulated, and a nonlinear mapping model is designed to simulate the adjustment process of rod cells and cone cells, so that a bright and dark self-adaptation function can be obtained, and a bright and dark information fusing function is determined according to illumination distribution, and global self-adaptive adjustment is performed on brightness components; and the local contrast of the enhanced brightness image will be decreased, so that local self-adaptive contrast enforcement is performed on the image through adopting an exponential function; and finally, and color restoration is performed on the enhanced image. With the human visual perception simulation-based self-adaptive low-illumination image enhancement method of the invention adopted, the brightness, local contrast and detail information of the low-illumination color image can be effectively improved, and especially, the method has obvious effects in dark area and highlight area enhancement.

Isolated, mammalian, adult bone marrow-derived, lineage negative hematopoietic stem cell populations (Lin− HSCs) contain endothelial progenitor cells (EPCs) capable of rescuing retinal blood vessels and neuronal networks in the eye. Preferably at least about 20% of the cells in the isolated Lin− HSCs express the cell surface antigen CD31. The isolated Lin− HSC populations are useful for treatment of ocular vascular diseases and to ameliorate cone cell degeneration in the retina. In a preferred embodiment, the Lin− HSCs are isolated by extracting bone marrow from an adult mammal; separating a plurality of monocytes from the bone marrow; labeling the monocytes with biotin-conjugated lineage panel antibodies to one or more lineage surface antigens; removing of monocytes that are positive for the lineage surface antigens from the plurality of monocytes, and recovering a Lin− HSC population containing EPCs. The isolated Lin− HSCs also can be transfected with therapeutically useful genes. The treatment may be enhanced by stimulating proliferation of activated astrocytes in the retina using a laser.

Intraocular injection of adeno-associated viral (AAV) vectors has been an evident route for delivering gene drugs into the retina. Currently, the vectors need to be injected into the subretinal spacein order to provide gene delivery to cones. In this approach, gene delivery is limited to cells that contact the local "bleb" of injected fluid. Furthermore, retinal detachment that occurs during subretinal injections is a concern in eyes with retinal degeneration. Here, the inventors establish several new vector-promoter combinations to overcome the limitations associated with AAV-mediated cone transduction in the fovea with supporting studies in mouse models, human induced pluripotent stem cell-derived organoids, post-mortem human retinal explants and living macaques. They show that an AAV9variant provides efficient foveal cone transduction when injected into the subretinal space several millimeters away from the fovea, without detaching this delicate region. The delivery modality relies on a cone-specific promoter and result in high-level transgene expression compatible with optogenetic vision restoration. Accordingly, the present invention relates to method of expressing a polynucleotide of interest in the cone photoreceptors of a subject comprising subretinal delivery of a therapeutically effective amount of a recombinant AAV9-derived vector comprising a VP1 capsid protein asset forth in SEQ ID NO: 11 and the polynucleotide of interest under the control of the pR1.7 promoter as set forth in SEQ ID NO: 12.

The invention relates to a cone-cell density calculation method based on image identification. The method mainly solves the prior problem that density counting of cone cells is performed manually and an eye-ground adaptive confocal laser scanning ophthalmoscope is used to obtain a visual cone-cell image and after the response frequency of the cone cells is determined, low-pass filtering is used for denoising processing so as to establish a two-valued sequence. A local maximum value corresponding to a non-zero area is searched for so that the central position of the cone cells is found. After automatic identification of the visual cone cells in the image is completed, the number of the cone cells in the image is obtained with the assistance of manual correction and finally the density counting of the cone cells is achieved. When the function which adopts a computer to counting automatically is compared with a manual counting method, the automatic calculation method is accurate, high in statistical speed, high in automation degree, checkable in analysis result and improved in detection efficiency. At the same time, a manual correction function is added so that on the basis of software analysis, error identification can be removed manually and missed cone cells can be added and thus caused result deviation is prevented.

The invention relates to a method for making a color vision classification detection map. A detection map is made in the image processing software. The detection map includes two parts: the background layer and the digital layer. The digital layer includes a fixed digital layer and a variable digital layer. There is a certain color difference between the fixed digital layer and the background layer. The eye can clearly recognize the difference between the two colors; the color of the variable digital layer and the background layer are close to or the same, but the spectral reflectance curve has a large difference, forming a near-metameric pair or a metameric pair; choose two different Spectral primary color inks, inks, toners or dyes, reproduce the background layer of the inspection map-fixed digital layer and variable digital layer, and form a color vision classification inspection map on the printing material. The detection map can quickly and conveniently classify the spectral response capabilities of red, green and blue cone cells of normal color vision observers, thereby dividing the color discrimination ability of normal color vision observers.

The invention discloses a method for obtaining retinal tissue rich in cone and rod cells by using human induced pluripotent stem cells. It includes digesting hiPSCs to obtain cell pellets, and then suspending the cell pellets to obtain embryoid bodies; the embryoid bodies are then inoculated into culture dishes pre-coated with Matrigel, and induced to differentiate in the induction medium to obtain neural retina (NR) and RPE; NR and RPE were re-provoked and cultured in suspension to obtain 3D retinal tissue including NR tissue, and then continued to be cultured in suspension in an optimized culture medium without retinoic acid. NR differentiated into all retinal cells, including highly mature photoreceptors cells, Rhodopsin-positive rod cells, L / M OPSIN-positive red-green cone cells and S-OPSIN-positive blue cone cells, especially retinotopic tissues rich in red-green cone and rod cells were obtained.

The invention discloses a marker for detecting or assisting in detecting retinal cone cells and an application thereof. The present invention provides the application of a substance for detecting whether the RBP4 protein is expressed in the sample to be tested in at least one of the following: a1) identification or auxiliary identification of retinal cone cells; a2) screening or auxiliary screening of retinal cone cells; a3) evaluation or Auxiliary evaluation of retinal cone cells; a4) identification or auxiliary identification of whether the sample to be tested contains retinal cone cells; a5) screening or auxiliary screening of whether the sample to be tested contains retinal cone cells; a6) evaluation or auxiliary evaluation of whether the sample to be tested contains Retinal cone cells; the present invention finds that RBP4 can be used as a marker to identify or assist in the identification of retinal cone cells by constructing and analyzing a cynomolgus monkey retinal cone cell sequencing library and immunofluorescence detection. The above markers can be used to evaluate retinal aging-related diseases such as macular degeneration and retinitis pigmentosa. The invention has important application value.