Cataracts don't arrive all at once. They build over years, and the words your eye doctor uses for that, early, mature, hypermature, describe how dense the lens has become. More than half of all Americans have a cataract or have had cataract surgery by the age of 80, so this is a road most people end up on. This page walks through the types of cataract, the stages, what each one looks like from the inside, and what changes as they progress.

One thing the stage does not tell you is when to have surgery. That gets its own section further down, because it's the question most people actually came here to ask.

What Are Cataracts?

A cataract is a clouding of the lens inside your eye, the lens that is normally clear. As it clouds, less light reaches the retina, and vision gets blurry, dim, or hard to use at night. Left alone for long enough, a cataract can take vision down to almost nothing.

The lens does about a third of the eye's focusing. The cornea at the front does the rest. When the lens clouds, that third stops doing its job cleanly.

Cataracts tend to develop slowly, often over many years. They can affect one or both eyes, and they are the leading cause of blindness in the world, mostly in places where the operation is hard to get. If you want the fuller picture of what a cataract is and how it forms, what are cataracts is the page for that.

Types of Cataracts

Type and stage are two different things, and the two get mixed up on a lot of pages. The type says where in the lens the clouding sits. The stage says how dense it has become. Any type can be at any stage.

The three common types:

• Nuclear sclerotic cataract (NS): Clouding in the center of the lens. This is the typical age-related cataract. The center slowly yellows, then browns, and distance vision goes before near vision does. Some people notice their reading vision seems a little better for a while as the lens changes. That can be the cataract shifting the eye's focus, not a cure.
• Cortical spoking cataract (CS): White, wedge-shaped opacities that start at the edge of the lens and work their way toward the center, like spokes. Glare is the usual complaint.
• Posterior subcapsular cataract (PSC): A small plaque that forms at the back of the lens, right in the path of light. It can cause trouble early, especially with reading and bright light, even when the rest of the lens looks fine. This is the type that steroid medicines tend to cause.

Less common types:

• Congenital Cataract: Present at birth or forming in a child's first year. They may be genetic or linked to an infection or injury before birth. They don't always affect vision, but if they do, they may need to be removed so the child's vision can develop.
• Traumatic Cataract: Forms after an injury to the eye. The injury may be a direct blow, a penetrating wound, or even the shock wave from an explosion. The cataract may appear right after the injury, or months or years later.

Why the stage matters

The stage tells your eye doctor three things: how dense the lens has become, roughly how it has been changing, and what the operation will involve if you get there. A very dense lens takes more work to remove. That's the practical reason I like to have a cataract watched once it's found, even when nothing needs doing yet. Not because the stage decides anything on its own, but because I'd rather know how it's moving.

The Stages of Cataract Development

The stages describe density, from a lens that is barely clouded to one that has gone almost fully opaque. They are descriptions, not a formal scale. When your eye doctor grades a cataract in the exam room, they use a standardized grading system that scores the color and cloudiness of each part of the lens. The words below are the plain-English version of that.

1. Early (immature) cataract: What you notice: Often nothing. Maybe slightly cloudy vision, or more trouble with glare, especially driving at night. What we do: Update the glasses if that helps, and keep an eye on it.
2. Mature cataract: What you notice: Vision that is clearly worse and that new glasses don't fix. Glare and halos at night. Colors look faded or yellowed. Sometimes double or multiple images in one eye. What we do: This is usually where the surgery conversation happens, and the deciding factor is what the cataract is doing to your day, not the word "mature."
3. Hypermature cataract: What you notice: Vision has dropped a long way, sometimes to light and shapes. What we do: Surgery is nearly always the answer here. The lens is dense enough that the operation takes more work, so this is the stage where I'd want to see you more often, not less.

Symptoms of Cataracts

The six things people notice most often, before anyone has said the word cataract:

• Blurred or cloudy vision
• Increased sensitivity to light and glare
• Seeing "halos" around lights
• Fading or yellowing of colors
• Double vision in one eye
• Continuously changing eye glasses prescription

These symptoms don't necessarily mean you have a cataract. Other eye conditions cause the same ones, which is why they warrant an eye exam rather than a guess. Where each one shows up in an ordinary week, what to do about it, and the video that walks through all six: Cataract symptoms: the 6 things you notice first.

Progression Rate of Cataracts

Cataracts develop slowly, often over many years. How fast varies from person to person, and a few things speed it up:

• Age: The older the eye, the faster an age-related cataract tends to move.
• Diabetes: People with diabetes develop cataracts earlier, on average by a couple of decades, and the cataracts move faster.
• UV exposure: Years of unprotected sun exposure hasten cataract progression.
• Smoking and alcohol: Both accelerate cataract development.
• Steroid medicines: Steroids like prednisone, taken long enough or at a high enough dose, can cause cataracts, classically the posterior subcapsular type.

The hypermature cataract: a closer look

Hypermature is where the lens has gone almost completely opaque and vision has dropped a long way. There isn't a deadline even here, but the window has narrowed. Surgery is usually the right call at this point, and the conversation is about when, not whether. The natural lens is replaced with an intraocular lens, the same operation as at any other stage. It's just harder to do on a lens this dense. What the operation involves, start to finish, is in the cataract surgery guide.

Treatment Options for Different Stages

Here's the honest version of this section: treatment isn't decided by the stage. It's decided by what the cataract is doing to your life and whether new glasses can fix it. That's the primary indication for the operation, at every stage.

• Early cataract: Prescription glasses, anti-glare lenses, or contact lenses often carry you for a while. If the cataract is already costing you something, though, early is not too early to talk.
• Mature cataract: Cataract surgery to remove the cloudy lens and replace it with an artificial intraocular lens, when the vision loss is getting in the way of your day. Which lens goes in is its own decision, and best lens for cataract surgery walks through the options. If you're wondering what the operation is like from your side of it, what do you see during cataract surgery answers that.
• Hypermature cataract: Surgery is nearly always recommended. The operation takes more work on a lens this dense, which is why I'd rather not meet a cataract for the first time at this stage. What the weeks after surgery look like is in cataract surgery recovery.
• Congenital cataracts: Monitoring, or surgery in younger patients if it affects vision development.

The stage is one input. It describes your lens. It doesn't describe your day, and your day is what decides the next step.

When is it time for cataract surgery?

The stage tells you what your lens looks like. It doesn't tell you whether to do anything about it, and that's the question most people actually came here to ask. I made a video on exactly that decision. It's the conversation I'd have with you across the desk.

In it: the one thing the eye chart can't see about your vision, the measure eye surgeons actually use to decide, a colleague of mine whose case changed how I make this call, and a straight answer on whether there's a deadline. There's also a longer article to go with it, with the things that got cut for time: when to have cataract surgery, and what the eye chart can't tell you.

Prevention and Care

Nothing has been shown to prevent an age-related cataract, and no diet, supplement, or eye drop reverses one once it's there. What you can do is take the known accelerators off the table:

• Wear sunglasses that block UV when you're out in the sun.
• Keep diabetes and other medical conditions well controlled.
• Don't smoke.
• If you take steroid medicines long-term, make sure your eye doctor knows.

Common questions

The short version

A cataract's type says where it is. Its stage says how dense it is. Whether it's time to do something about it is a different question, and the video above is where I answer it.

Reviewed by Hussain Elhalis, MD · September 17, 2026