Cataract ou, od, os means what?

Written by Li Zhen Dong

Ophthalmology

Updated on January 20, 2025

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OU, OD, and OS are common descriptions in ophthalmology. OU represents both eyes, OD represents the right eye, and OS represents the left eye. These are abbreviations. For example, visual acuity for both eyes is denoted as OU, visual acuity for the left eye as OS, and visual acuity for the right eye as OD. These terms are typically used in medical records, not only to describe conditions like cataracts. For instance, the condition of cataracts in both eyes would be described as OU: OD 0.1, OS 0.3.

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Written by Peng Xi Feng

Ophthalmology

48sec

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How is a cataract formed?

Inside the eyeball, there is a relatively important transparent tissue called the lens. Clinically, clouding of the lens is referred to as cataracts. Many factors, such as aging, genetics, metabolic abnormalities like diabetes, trauma, radiation, poisoning, and local nutritional disorders, can lead to damage to the capsule of the lens, increasing its permeability and losing its barrier function, or causing metabolic disturbances in the lens. This can cause the proteins in the lens to denature, leading to cloudiness of the lens, which is known as cataracts. Under a slit lamp microscope, varying degrees of cloudiness in the lens can be observed.

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Written by Deng Jiang Tao

Ophthalmology

1min 5sec

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Consequences of not undergoing cataract surgery

First, it is important to understand what cataracts are. Cataracts are the clouding of the lens cortex, which commonly refers to the gradual whitening of the central pupil area, the black part of the eye. Cataracts, based on their stage of development, are divided into early, middle, and late stages. In the early stage of cataract, the vision is slightly impaired. In the middle stage, the cortex becomes moderately clouded, and vision might still be around 0.4 or 0.5. In the late stage, the cataract is severely matured, generally with vision lower than 0.3. Cataract in its early and middle stages might not necessarily require immediate surgery. However, in late stages, when vision drops below 0.3, surgery should be considered. If not treated surgically, the mature cataract can completely block light, progressively decreasing vision and eventually leading to blindness. Therefore, it is advisable to consider surgical treatment for cataracts in the late stage.

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Written by Li Min

Ophthalmology

46sec

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Is cataract easy to treat?

If you are diagnosed with cataracts, we generally use surgical methods nowadays. Our surgical approach typically involves cataract phacoemulsification combined with the implantation of an artificial lens. If you have a simple case of cataracts without any other eye diseases—such as glaucoma, diabetic retinopathy, hypertensive retinopathy, or central retinal vein occlusion—the outcome after surgery is generally good. As for the eye drops for treating cataracts advertised on TV, like Sharp Eye Love, their effectiveness is not very certain in our medical practice. Currently, the main method of treating cataracts is still through surgery.

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Written by Wang Hui Zhen

Ophthalmology

1min 14sec

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Advantages and disadvantages of cataract surgery for the elderly

Any surgery carries risks, and cataract surgery is no exception. However, many elderly people have mature cataracts that require prompt surgical treatment. If not addressed timely, it can lead to blindness or even cause secondary glaucoma, leading to symptoms such as eye pain, headaches, nausea, and vomiting. In some advanced cases, it can lead to neovascular glaucoma, making it difficult to control intraocular pressure. Cataracts are a vision-impairing disease caused by the clouding of the lens, which is an important optical component in the human eyeball. Normally, the lens is transparent. In elderly people, the lens proteins often degenerate and age, leading to cloudiness and various degrees of vision impairment. It is advisable for those with cataracts to seek prompt ophthalmologic care and, if necessary, undergo cataract removal surgery. Complications and sequelae from cataract surgery may include postoperative infection, shallow anterior chamber, corneal edema, explosive bleeding, macular edema, and more.

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Written by Li Zhen Dong

Ophthalmology

38sec

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Cataract ou, od, os means what?

OU, OD, and OS are common descriptions in ophthalmology. OU represents both eyes, OD represents the right eye, and OS represents the left eye. These are abbreviations. For example, visual acuity for both eyes is denoted as OU, visual acuity for the left eye as OS, and visual acuity for the right eye as OD. These terms are typically used in medical records, not only to describe conditions like cataracts. For instance, the condition of cataracts in both eyes would be described as OU: OD 0.1, OS 0.3.