Dogs suffering from secondary lens luxation: in these patients, something else has occurred within the eye that has caused the slipping of the lens.Treatment decisions about both eyes must therefore be made at the time of diagnosis of primary lens luxation! This means that if your dog is diagnosed with primary lens luxation in one eye, the second eye will invariably become affected at some point in the future. In dogs with primary lens luxation, both eyes are affected with the disease but it usually only manifestes in one eye first. DNA testing for the condition is available in many of the breeds (see ). The condition is common in the terrier breeds but also occasionally seen in the Collie, German Shepherd and Shar Pei. Dogs suffering from primary lens luxation: these patients are born with a genetic defect that results in a breakdown of the lens zonules – which usually occurs at a young age.Why does my dog have lens luxation?Īfter the diagnosis of lens luxation is made, your ophthalmologist will usually decide which one of two categories your dog belongs to: Lenses that are floating within the back of the eye tend to cause less acute damage but may also be harmful to the retina at the back of the eye with time. Removal of the eye is then required to alleviate the pain. If the lens is stuck in the front of the eye, it will almost always cause pain and vision loss – which with time becomes irreversible. What happens if lens luxation is left un-treated Emergency treatment is usually required for lenses that have luxated into the front of the eye and your vet usually will try and recommend urgent referral upon diagnosis. Lenses that are trapped in the front of the eye are likely to cause increases in intraocular pressure - termed glaucoma – which can be blinding. This is likely to cause acute pain and vision loss and you may notice that your dog’s eye is sore and blue. If the lens falls into the back of the eye, it may not be noticed for quite some time – but it is more likely that the lens will slip into the front of the eye – where it becomes stuck between cornea and iris. However, with time, the lens may become fully detached and will start to move freely. ![]() This often happens without you noticing and only an experienced ophthalmologist is likely to be able to pick up the earliest signs of lens luxation with special eye examination equipment. Initially, the lens is likely to only be a little bit ‘wobbly’ and it may sink towards the lower part of the pupil. In some patients, these zonules can break down and as a result, the lens becomes instable and starts to move within the eye. The lens is normally held in place by thin fibres called ‘zonules’. The crystalline lens is suspended behind the pupil where it helps to direct light rays onto the retina, where a visual image is formed. The following information is intended to explain why lens luxation can occur, what it means for you and your dog and what treatment options are available. Your dog has been diagnosed with lens luxation.
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