1. Appearance of spots in vision
Some of the cataract patients start complaining about seeing dark spots before their eyes, even though there are none in reality. This is due to the imbalance in the amount of light accepted by the eye due to the cataract.
2. Double vision in a single eye
Due to the formation of the cataract film, the retina finds it difficult to generate the image as per the visual input. The affected people start complaining about seeing the same thing ‘twice’ before their eyes at the same time. This is one of the first symptoms of cataract.
3. Fading or yellowing of colors
Cataract, when it forms, not only affects the entry of light into the eyes, but also blocks the blue part of the visible spectrum removing the blue light from the image. The result is the combination of rest of the primary light colors: yellow. As the cataract persists over a time, it starts blocking other light frequencies as well, leading to fading of the colors.
4. Frequent changes in eyeglass or contact lens prescription
Due to the gradual enlargement of the cataract and formation of the film in the lens, the viewer starts to face fluctuating visionary power, leading to continuous change in eyeglass or contact lenses as per the fluctuating power.
5. Increased near sightedness
Due to the enlargement of cataract, the person starts to see near objects much more clearly than usual. This situation is known as increased myopia and warns the patient of the onset of the cataract.
6. Seeing ‘halos’ around lights
Another symptom of cataract is the appearance of halos around the light sources. The affected person starts to feel as if he/she is walking in a dream, with light refracting more than usual around the point sources.
7. Sensitivity to light and glare
When the thin film starts to form in the lens, the amount of light received by the light is disrupted massively. Some part of the eye receives more light than others. This, added with imbalance in reception of light between the two eyes, makes the viewer sensitive to light and glare and cannot look at shrap sources of light, such as street lights and bulbs, for a long time.
8. Increasing difficulty with vision at night
In night, the amount of light received by the eye to generate the corresponding image is already low. Adding to this lowness is the film on the lens, which cuts off light as per its severity. This leads to lesser light available than usual for the eye to generate images, further leading to darkening of the image. This increases the difficulty of the viewer to see at night.
9. Clouded, blurred or dim vision
Due to the formation of a near opaque layer in the lens, the amount of light entering the eye is reduced drastically. Due to the lack of sufficient light to perceive the image, the eye sends image-related signals to the brain equivalent to the image a normal eye would have perceived in low light conditions. Due to this, the final image available for the patient to see is clouded, blurred or dimmed, the intensity depending upon the cataract. In some cases, when the severity of the cataract is very high, the viewer can’t see the object and is termed ‘blind’.